I've set up my own Jabber server using Openfire and added a bunch of IM gateways (ICQ, MSN, etc). Really works well for the N800 with the new RTComm package.

After playing with things for a bit with a couple N800's it looks the video conferencing capabilities are just tied to using jingle-audio and jingle-video over XMPP. (I see those listed capabilities for the N800 clients)

Are there any PC Jabber clients that support jingle-audio/jingle-video ?

I see lots of mentions about it on the net but have yet to find a client (beta, alpha or otherwise...)