I have skype working on my tab with TnT lite 3.4 right now.
the android app doesnt have video yet, but i pay 3 bucks a month for unlimited calling in the US and my tab work beautiful to make calls, ordered a pizza off of it last night.
If your looking to video chat, the yahoo messenger app works great regonizes the camera built in.
But you have to download the yahoo mess app from the market and install it first, and then search for the yahoo messenger video add-on app for the video to work.
Good luck hope this helps.