diff --git a/package.json b/package.json
index 2da20805c1..d51f3a05ba 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
     "flux": "^2.0.3",
     "glob": "^5.0.14",
     "linkifyjs": "^2.0.0-beta.4",
-    "matrix-js-sdk": "^0.3.0",
+    "matrix-js-sdk": "https://github.com/matrix-org/matrix-js-sdk.git#develop",
     "optimist": "^0.6.1",
     "q": "^1.4.1",
     "react": "^0.14.2",
diff --git a/src/Presence.js b/src/Presence.js
index d77058abd8..e776cca078 100644
--- a/src/Presence.js
+++ b/src/Presence.js
@@ -15,58 +15,54 @@ limitations under the License.
 */
 
 var MatrixClientPeg = require("./MatrixClientPeg");
+var dis = require("./dispatcher");
 
  // Time in ms after that a user is considered as unavailable/away
 var UNAVAILABLE_TIME_MS = 3 * 60 * 1000; // 3 mins
 var PRESENCE_STATES = ["online", "offline", "unavailable"];
 
-// The current presence state
-var state, timer;
-
-module.exports = {
+class Presence {
 
     /**
      * Start listening the user activity to evaluate his presence state.
      * Any state change will be sent to the Home Server.
      */
-    start: function() {
-        var self = this;
+    start() {
         this.running = true;
-        if (undefined === state) {
-            // The user is online if they move the mouse or press a key
-            document.onmousemove = function() { self._resetTimer(); };
-            document.onkeypress = function() { self._resetTimer(); };
+        if (undefined === this.state) {
             this._resetTimer();
+            this.dispatcherRef = dis.register(this._onUserActivity.bind(this));
         }
-    },
+    }
 
     /**
      * Stop tracking user activity
      */
-    stop: function() {
+    stop() {
         this.running = false;
-        if (timer) {
-            clearTimeout(timer);
-            timer = undefined;
+        if (this.timer) {
+            clearInterval(this.timer);
+            this.timer = undefined;
+            dis.unregister(this.dispatcherRef);
         }
-        state = undefined;
-    },
+        this.state = undefined;
+    }
 
     /**
      * Get the current presence state.
      * @returns {string} the presence state (see PRESENCE enum)
      */
-    getState: function() {
-        return state;
-    },
+    getState() {
+        return this.state;
+    }
 
     /**
      * Set the presence state.
      * If the state has changed, the Home Server will be notified.
      * @param {string} newState the new presence state (see PRESENCE enum)
      */
-    setState: function(newState) {
-        if (newState === state) {
+    setState(newState) {
+        if (newState === this.state) {
             return;
         }
         if (PRESENCE_STATES.indexOf(newState) === -1) {
@@ -75,33 +71,42 @@ module.exports = {
         if (!this.running) {
             return;
         }
-        state = newState;
-        MatrixClientPeg.get().setPresence(state).done(function() {
+        var old_state = this.state;
+        this.state = newState;
+        var self = this;
+        MatrixClientPeg.get().setPresence(this.state).done(function() {
             console.log("Presence: %s", newState);
         }, function(err) {
             console.error("Failed to set presence: %s", err);
+            self.state = old_state;
         });
-    },
+    }
 
     /**
      * Callback called when the user made no action on the page for UNAVAILABLE_TIME ms.
      * @private
      */
-    _onUnavailableTimerFire: function() {
+    _onUnavailableTimerFire() {
         this.setState("unavailable");
-    },
+    }
+
+    _onUserActivity() {
+        this._resetTimer();
+    }
 
     /**
      * Callback called when the user made an action on the page
      * @private
      */
-    _resetTimer: function() {
+    _resetTimer() {
         var self = this;
         this.setState("online");
         // Re-arm the timer
-        clearTimeout(timer);
-        timer = setTimeout(function() {
+        clearTimeout(this.timer);
+        this.timer = setTimeout(function() {
             self._onUnavailableTimerFire();
         }, UNAVAILABLE_TIME_MS);
     } 
-};
+}
+
+module.exports = new Presence();
diff --git a/src/UserActivity.js b/src/UserActivity.js
new file mode 100644
index 0000000000..cee1b4efe2
--- /dev/null
+++ b/src/UserActivity.js
@@ -0,0 +1,57 @@
+/*
+Copyright 2015 OpenMarket Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+var dis = require("./dispatcher");
+
+var MIN_DISPATCH_INTERVAL = 1 * 1000;
+
+/**
+ * This class watches for user activity (moving the mouse or pressing a key)
+ * and dispatches the user_activity action at times when the user is interacting
+ * with the app (but at a much lower frequency than mouse move events)
+ */
+class UserActivity {
+
+    /**
+     * Start listening to user activity
+     */
+    start() {
+        document.onmousemove = this._onUserActivity.bind(this);
+        document.onkeypress = this._onUserActivity.bind(this);
+        this.lastActivityAtTs = new Date().getTime();
+        this.lastDispatchAtTs = 0;
+    }
+
+    /**
+     * Stop tracking user activity
+     */
+    stop() {
+        document.onmousemove = undefined;
+        document.onkeypress = undefined;
+    }
+
+    _onUserActivity() {
+        this.lastActivityAtTs = (new Date).getTime();
+        if (this.lastDispatchAtTs < this.lastActivityAtTs - MIN_DISPATCH_INTERVAL) {
+            this.lastDispatchAtTs = this.lastActivityAtTs;
+            dis.dispatch({
+                action: 'user_activity'
+            });
+        }
+    }
+}
+
+module.exports = new UserActivity();
diff --git a/src/controllers/atoms/MemberAvatar.js b/src/controllers/atoms/MemberAvatar.js
index a94b4291a0..e170d2e04c 100644
--- a/src/controllers/atoms/MemberAvatar.js
+++ b/src/controllers/atoms/MemberAvatar.js
@@ -35,6 +35,10 @@ module.exports = {
         }
     },
 
+    componentWillReceiveProps: function(nextProps) {
+        this.refreshUrl();
+    },
+
     defaultAvatarUrl: function(member, width, height, resizeMethod) {
         if (this.skinnedDefaultAvatarUrl) {
             return this.skinnedDefaultAvatarUrl(member, width, height, resizeMethod);
@@ -52,7 +56,7 @@ module.exports = {
         });
     },
 
-    getInitialState: function() {
+    _computeUrl: function() {
         var url = this.props.member.getAvatarUrl(
             MatrixClientPeg.get().getHomeserverUrl(),
             this.props.width,
@@ -68,8 +72,20 @@ module.exports = {
                 this.props.resizeMethod
             );
         }
+        return url;
+    },
+
+    refreshUrl: function() {
+        var newUrl = this._computeUrl();
+        if (newUrl != this.currentUrl) {
+            this.currentUrl = newUrl;
+            this.setState({imageUrl: newUrl});
+        }
+    },
+
+    getInitialState: function() {
         return {
-            imageUrl: url
+            imageUrl: this._computeUrl()
         };
     }
 };
diff --git a/src/controllers/atoms/RoomAvatar.js b/src/controllers/atoms/RoomAvatar.js
index 6c55345ead..57c9a71842 100644
--- a/src/controllers/atoms/RoomAvatar.js
+++ b/src/controllers/atoms/RoomAvatar.js
@@ -41,10 +41,26 @@ module.exports = {
     },
 
     componentWillReceiveProps: function(nextProps) {
-        this._update();
-        this.setState({
-            imageUrl: this._nextUrl()
-        });
+        this.refreshImageUrl();
+    },
+
+    refreshImageUrl: function(nextProps) {
+        // If the list has changed, we start from scratch and re-check, but
+        // don't do so unless the list has changed or we'd re-try fetching
+        // images each time we re-rendered
+        var newList = this.getUrlList();
+        var differs = false;
+        for (var i = 0; i < newList.length && i < this.urlList.length; ++i) {
+            if (this.urlList[i] != newList[i]) differs = true;
+        }
+        if (this.urlList.length != newList.length) differs = true;
+
+        if (differs) {
+            this._update();
+            this.setState({
+                imageUrl: this._nextUrl()
+            });
+        }
     },
 
     _update: function() {
diff --git a/src/controllers/organisms/MemberList.js b/src/controllers/organisms/MemberList.js
index 7d4326ef69..8b6733fbeb 100644
--- a/src/controllers/organisms/MemberList.js
+++ b/src/controllers/organisms/MemberList.js
@@ -38,6 +38,7 @@ module.exports = {
     componentWillMount: function() {
         var cli = MatrixClientPeg.get();
         cli.on("RoomState.members", this.onRoomStateMember);
+        cli.on("RoomMember.name", this.onRoomMemberName);
         cli.on("Room", this.onRoom); // invites
     },
 
@@ -45,6 +46,7 @@ module.exports = {
         if (MatrixClientPeg.get()) {
             MatrixClientPeg.get().removeListener("Room", this.onRoom);
             MatrixClientPeg.get().removeListener("RoomState.members", this.onRoomStateMember);
+            MatrixClientPeg.get().removeListener("RoomMember.name", this.onRoomMemberName);
             MatrixClientPeg.get().removeListener("User.presence", this.userPresenceFn);
         }
     },
@@ -97,6 +99,10 @@ module.exports = {
         this._updateList();
     },
 
+    onRoomMemberName: function(ev, member) {
+        this._updateList();
+    },
+
     _updateList: function() {
         this.memberDict = this.getMemberDict();
 
diff --git a/src/controllers/organisms/RoomList.js b/src/controllers/organisms/RoomList.js
index ff3522d9c3..6b5a4c4722 100644
--- a/src/controllers/organisms/RoomList.js
+++ b/src/controllers/organisms/RoomList.js
@@ -29,6 +29,7 @@ module.exports = {
         cli.on("Room.timeline", this.onRoomTimeline);
         cli.on("Room.name", this.onRoomName);
         cli.on("RoomState.events", this.onRoomStateEvents);
+        cli.on("RoomMember.name", this.onRoomMemberName);
 
         var rooms = this.getRoomList();
         this.setState({
@@ -89,6 +90,10 @@ module.exports = {
         this.refreshRoomList();
     },
 
+    onRoomMemberName: function(ev, member) {
+        this.refreshRoomList();
+    },
+
     refreshRoomList: function() {
         var rooms = this.getRoomList();
         this.setState({
diff --git a/src/controllers/organisms/RoomView.js b/src/controllers/organisms/RoomView.js
index 105392de0b..3a5d432ebd 100644
--- a/src/controllers/organisms/RoomView.js
+++ b/src/controllers/organisms/RoomView.js
@@ -43,6 +43,7 @@ module.exports = {
         this.dispatcherRef = dis.register(this.onAction);
         MatrixClientPeg.get().on("Room.timeline", this.onRoomTimeline);
         MatrixClientPeg.get().on("Room.name", this.onRoomName);
+        MatrixClientPeg.get().on("Room.receipt", this.onRoomReceipt);
         MatrixClientPeg.get().on("RoomMember.typing", this.onRoomMemberTyping);
         this.atBottom = true;
     },
@@ -59,6 +60,7 @@ module.exports = {
         if (MatrixClientPeg.get()) {
             MatrixClientPeg.get().removeListener("Room.timeline", this.onRoomTimeline);
             MatrixClientPeg.get().removeListener("Room.name", this.onRoomName);
+            MatrixClientPeg.get().removeListener("Room.receipt", this.onRoomReceipt);
             MatrixClientPeg.get().removeListener("RoomMember.typing", this.onRoomMemberTyping);
         }
     },
@@ -87,6 +89,9 @@ module.exports = {
                     messageWrapper.scrollTop = messageWrapper.scrollHeight;
                 }
                 break;
+            case 'user_activity':
+                this.sendReadReceipt();
+                break;
         }
     },
 
@@ -149,6 +154,12 @@ module.exports = {
         }
     },
 
+    onRoomReceipt: function(receiptEvent, room) {
+        if (room.roomId == this.props.roomId) {
+            this.forceUpdate();
+        }
+    },
+
     onRoomMemberTyping: function(ev, member) {
         this.forceUpdate();
     },
@@ -164,6 +175,8 @@ module.exports = {
 
             messageWrapper.scrollTop = messageWrapper.scrollHeight;
 
+            this.sendReadReceipt();
+
             this.fillSpace();
         }
     },
@@ -346,7 +359,7 @@ module.exports = {
                 }
             }
             ret.unshift(
-                <li key={mxEv.getId()}><EventTile mxEvent={mxEv} continuation={continuation} last={last}/></li>
+                <li ref={this._collectEventNode.bind(this, mxEv.getId())} key={mxEv.getId()}><EventTile mxEvent={mxEv} continuation={continuation} last={last}/></li>
             );
             ++count;
         }
@@ -438,5 +451,54 @@ module.exports = {
                 uploadingRoomSettings: false,
             });
         }
+    },
+
+    _collectEventNode: function(eventId, node) {
+        if (this.eventNodes == undefined) this.eventNodes = {};
+        this.eventNodes[eventId] = node;
+    },
+
+    _indexForEventId(evId) {
+        for (var i = 0; i < this.state.room.timeline.length; ++i) {
+            if (evId == this.state.room.timeline[i].getId()) {
+                return i;
+            }
+        }
+        return null;
+    },
+
+    sendReadReceipt: function() {
+        if (!this.state.room) return;
+        var currentReadUpToEventId = this.state.room.getEventReadUpTo(MatrixClientPeg.get().credentials.userId);
+        var currentReadUpToEventIndex = this._indexForEventId(currentReadUpToEventId);
+
+        var lastReadEventIndex = this._getLastDisplayedEventIndex();
+        if (lastReadEventIndex === null) return;
+
+        if (lastReadEventIndex > currentReadUpToEventIndex) {
+            MatrixClientPeg.get().sendReadReceipt(this.state.room.timeline[lastReadEventIndex]);
+        }
+    },
+
+    _getLastDisplayedEventIndex: function() {
+        if (this.eventNodes === undefined) return null;
+
+        var messageWrapper = this.refs.messageWrapper;
+        if (messageWrapper === undefined) return null;
+        var wrapperRect = messageWrapper.getDOMNode().getBoundingClientRect();
+
+        for (var i = this.state.room.timeline.length-1; i >= 0; --i) {
+            var ev = this.state.room.timeline[i];
+            var node = this.eventNodes[ev.getId()];
+            if (node === undefined) continue;
+
+            var domNode = node.getDOMNode();
+            var boundingRect = domNode.getBoundingClientRect();
+
+            if (boundingRect.bottom < wrapperRect.bottom) {
+                return i;
+            }
+        }
+        return null;
     }
 };
diff --git a/src/controllers/pages/MatrixChat.js b/src/controllers/pages/MatrixChat.js
index c2f0589688..4655011a45 100644
--- a/src/controllers/pages/MatrixChat.js
+++ b/src/controllers/pages/MatrixChat.js
@@ -16,6 +16,7 @@ limitations under the License.
 
 var MatrixClientPeg = require("../../MatrixClientPeg");
 var RoomListSorter = require("../../RoomListSorter");
+var UserActivity = require("../../UserActivity");
 var Presence = require("../../Presence");
 var dis = require("../../dispatcher");
 
@@ -104,6 +105,7 @@ module.exports = {
                     window.localStorage.clear();
                 }
                 Notifier.stop();
+                UserActivity.stop();
                 Presence.stop();
                 MatrixClientPeg.get().stopClient();
                 MatrixClientPeg.get().removeAllListeners();
@@ -362,6 +364,7 @@ module.exports = {
             });
         });
         Notifier.start();
+        UserActivity.start();
         Presence.start();
         cli.startClient();
     },