Popcap games - Bookworm and Bejeweled exclusive to the DS, eh?
Next Level Games - They've been so close with Nintendo I think it's only a matter of time. It's not too far away from NOA headquarters either.
2D Boy - They get 3 or so more employees, but if they keep making stuff as big as World of Goo, it's worth it.
Harmonix - Give them Wii Music 2, they'll do it right.
Namco - Pac-man, Soul Caliber, Tekken, etc.