Google doesn't give a damn about Linux. Period. They never have and probably never will.

Also Android is not "open" and not Linux. Those are lies. (custom Java env. in a linux scratchbox counts about as much as M$'s linux patches to work better in Window's VM emulator)

Last I checked GTalk's video functionality relies on Adobe Flash. Adobe is another company that hates Linux. That's why we have Flash 9 on the tablets (and LUCKY at that). You don't see flash on any other non-x86 architecture (except for PPC). heh. Anyway webcam => Flash implementations are Windows only. (I think OSX gets shafted as well as Linux/BSD/etc. but not 100% sure).

Bottom-line: http://www.google.com/talk/otherclients.html
the tablets run Linux, no GTalk webcam support for Linux. and as usual good luck with Linux + ARM.

Sorry.

Your options are....*drum-roll*
Gizmo5 (Windows) <=> N800/N810
N800/N810 <=> N800/N810

and maybe Ekiga if that is ever properly ported.

on the Linux desktop (x86) the choices are pretty slim as well. And the best program with webcam support is Cheese which doesn't have any kind of network support (just takes photos/videos) which is about all the camera on the N800/N810 is good for as well -_-

oh and also be angry at Skype, they promised video support on the tablets and never kept that promise.