No sound with rdesktop or VNC(also, I've not seen a VNC build for OS 2008 Chinook; doesn't mean it's not available, just not seen it.).

It seems to me that you want to run video on your N800 hosted on your PC. I use TVersity. It works great via either your browser or via uPNP with the Nokia NIT Media Streamer. Alternately you can use ORB or WeBot (just pix and music for Webot for now though but I would bet money that video will come for it sooner or later)

http://www.tversity.com/home
http://www.webot.com/index.cfm?event=N810
http://corp.orb.com/n800/

Crouching Hamster