First beta test game I got with my black box (ATI card) was Team Fortress 2. This game is very funny and very well put together, there has been drastic changes since TFC but some are for the better, no more nade spam! However the game was crashing pretty often for me, seem to have reduced that by reading info on the steam forums. CRY SOME MORE.

The other beta I have is under NDA, so I'll probably be killed in my sleep for saying anything. It's mp but I must say that its better than I thought it would be, much improved over the developers last efforts. I'll probably still prefer the sp side of the game but the first impression is very promising. You'll have to guess what game I'm talking about ;)

Review: Bioshock