Anyone looking for some great old school gaming should get Space Miner: Space Ore Bust. It's a cross between Asteroids and those old adventures games like Monkey Island or Full Throttle. There's also some RPG elements to it like armor and weapons upgrades. [youtube="http://www.youtube.com/watch?v=RtmU42DYQrI&feature=player_embedded#"]
With title like Fieldrunners, GeoDefense, The Creeps and now Space Miner, the iPhone is becoming my favorite gaming platform. Sure, the games are shorter and the graphics not as impressive, but the limits (screen-size, memory, speed...) countered with the touch screen are really bring out more creativity. Besides I can't really play BioShock or Modern Warfare waiting in line at the supermarket.