ups7
NCAA Football is obviously a big one (though the new title comes out in 3 months)
Lots of people play Halo, but not as many BPers. I'm not a fan (the original was great, the past 4 have been too much spray and pray battles)
Battlefield 3 will be the next big title, but it won't be out until the fall.
Some are playing Tiger Woods but that is mostly an isolated gaming title.
If you have a blockbuster near you that is running, I'd highly recommend a 1-month pass (which renews monthly). You can check out as many games as you want, which makes it easy to rent a crappy game that you'll be tired of in a day.
What types of games do you like?