Well my brother kidnapped my Pro after his RROD'd, so I decided an upgrade would be nice, and he decided to do the same.
We both got Left 4 Dead and were playing it far too much last night, I really do love that game, shame I didn't get it at release. Also got Burnout Paradise (bizarrely cheaper than buying it on it's own) with it, so I will be playing through that again over the weekend, as well as trying to get back into Fallout. So really this weekend is out for me, however the week after next I'm booked off, things I need to get done during the week, but over the 2 weekends I should be able to play.
I'd say as of right now, I'd want to play L4D, but would be happy to play Gears later on.