hey dont really have time to download applications onto my iphone
but since the time when i did, i have been enjoying:

taptap revenge/taptap revenge 2 - awesome!
hellboy 2
falling balls
topple - addictive!haha.
s.deadbeef (no idea why this one is named like this, but its an fighter plane game)
labyrinth/labyrinth 3d
duckshoot
vw newpolo
time crisis! - the dodging technic is quite amusing.
star wars force unleashed. - surprisingly entertaining.

p/s: hoping for more free good apps.
cant wait for OS 3.0. cheers!!