'Try for Free!' leads to a whole new set of ported 'native' 3D Arts games. Each can be played for one session, but once you've 'Exit'ed the game then that's it until you pay up. Good balance for a demo idea.
Alien Pinball and Soccer Pinball are very similar and smooth to play.
Also from the 3D Arts stable is this WW2 shoot 'em up. Again smooth and playable, without encroaching on N-Gage territory too much.
Flash games come to S60 in organised fashion?
I'm 99% certain that these will all be standard Java 'mobile' titles
And games from Nokia's 'SNAP' (also Java) system.