Sonic Speed Ball $1.99 -> Free
Actually an audio game rather than a "video" game, though the graphics are just as retro-appealing as the sound effects, this is a sort of Wii approach to an iOS ping pong game. Clever and well-implemented, with an effective single player mode as well as a Bluetooth-supporting two player mode. This could've been a gimmicky timer reaction game, but it plays and feels right. Solid ratings in the iTunes store so far, too.