I'm Mark Rejhon, the author of the XMPP/Jabber Real Time Text extension (xmpp.org/extensions/xep-0301.html).
Wikipedia: Real-time text
Animation: What real-time text looks like
I am researching open source clients (Miranda, Pidgin, Adium, etc) and determining which should be the first client that should gain this real-time text feature. I'd like all clients to support it; best practice is supporting it as an on/off feature through a supplemental menu item or button (like turning on/off audio and/or video).
I wrote some sample source code, which is available at realjabber.googlecode.com (C#), most particularly in the RealTimeText.cs module.
Anybody who would like to step up to the plate, and add real-time text to Miranda?