My favorite games right now are Asteroids (oh so retro) and "aTilt 3D Labyrinth".
I have the A855 Droid so Asteroids is fun using the pad. I wonder how you would play this game if you don't have the slider keyboard? Asteroids is by Mark Mainwood.
I got "aTilt 3D Labyrinth" initially because of the really nice graphics (yeah, I know it's just a wood box and a ball bearing....) but, it is one of the few really nice graphics on a game for the Droid. Anyway, it is great fun. When the ball touches a wood barrier it gives audible and tactile feedback. aTilt 3D Labyrinth is by FridgeCat Software