I must insist.

I have used and succesfully received and sent video between the N800 and a PC.
This works with the default SIP client using a voipbuster SIP account and a PC using xlite with another voipbuster account registered.

(to download xlite follow this: http://www.counterpath.net/x-lite.html
to get a voipbuster account go to: http://www.voipbuster.com/en/index.html)

I need to say I tried to use Gizmo yesterday and it just crashed and crashed. I had not used since the last OS upgrade and maybe something broke.

BUT SIP VIDEO BETWEEN N800 AND PC WORKS!!!