By popular demand, I’ve moved the Telepathy Developer’s Manual http://telepathy.freedesktop.org/doc/book/ rather than having it in my personal webspace.
Yes, it’s still a work in progress. No, it still doesn’t cover VoIP (I’ve been waiting for the new Channel.Type.Call to undraft). Yes, most of the examples still require porting to Mission Control 5 (this week maybe?). No, it doesn’t cover Qt4 yet (patches accepted).