Collapse - puzzle game
Everlands - Hard to describe...
Criticality - Very simple, but i find it quite fun
Barr - fun, but only 10 levels
Crush the Castle
Dungeon Hunter - From gameloft.com Diablo2-ish, dungeon crawler, random item stats. Pretty darn fun, and looks amazing! I was like "My phone can do this?!?!" definitely worth the 5 bucks.
Storm8 online "MMOs" are what they are if you're into that
Robodefense - seconded.
Armored Strike is pretty good as far as tank games go. Online play is cool.
Barcode beasts is amusing for awhile. See who's soda or cigs are stronger =] Dev is working on making it more feature filled.
Those are the ones on my game's hoemscreen.
Galaxy Domination was really fun. Simple graphics, but great fun. Sad there were "only 100 levels.
Retro defense - seconded
Bonsai Blast - seconded
Asphalt 5 is gameloft's racing game. it was pretty cool (demo's in marketplace), but I'm not a racing fan, so i don't know how good it actually was
Ohh, and remember, you get 24 hours to try out apps you buy!