add some documentation on the IM stuff

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+You can post messages to %%site.name%% using a [Jabber](http://jabber.org/) client
+on your computer, mobile phone, or other platform. ([GTalk](http://talk.google.com/),
+Google's Jabber program, will also work.) This can be a convenient way to keep
+up with your friends on %%site.name%%.
+
+If you don't already have a Jabber account, you can use GTalk or one of the other
+[public Jabber services](http://www.jabber.org/im-services). You'll probably also
+need an IM client like [Pidgin](http://www.pidgin.im/).
+
+Managing your IM settings
+-------------------------
+
+Use the [IM settings](%%action.imsettings%%) page to set your IM preferences. You can add or change your Jabber address and set the flags for Jabber update.
+
+When you add or change your address, you'll receive a message from **%%xmpp.user%%@%%xmpp.server%%** asking you to confirm the change. (You may need to
+add %%xmpp.user%%@%%xmpp.server%% to your buddy list *before* changing your IM
+settings; this is definitely true for GTalk.)
+
+Sending updates
+---------------
+
+You send updates by sending messages to %%xmpp.user%%@%%xmpp.server%%. Messages
+should be less than 140 characters; longer messages will be truncated.
+
+Commands
+--------
+
+You can do some minor management of your account through Jabber. These are the
+currently-implemented commands:
+
+* **on**: Turn on notifications. You'll receive copies of messages by people
+  you subscribe to.
+* **off**: Turn off notifications. You'll no longer receive Jabber
+  notifications.
+