A while back, I was watching my friends play a Metal Slug co-op game on the Wii. I have to say, it was fun just to watch all the way through: brilliant style; looked to be a great deal of fun to play.
Platformers are currently the thing, as that's what 2D is best for. Only other thing that comes to mind is racing, but then of course that transitioned to 3D ages ago, along with most everything else 2D does. (Oh, puzzle games are still in 2D, of course. And then you have games like, ahem, EBA, where the gameplay is essentially 2D, but they have some extra 3D tidbits.)
Basically, 2D is getting more cartoonish, as realism is left to all the high-end 3D stuff. There's no real way to compete, so 2D's gone in the opposite direction.
EBA; UI; Mario Land Ripoff.
Every time you post a joke in the form of code, mace yourself.