Moonz, a physics-based game from ADXSoft, was recently released in the app store. Simple in concept but aggravatingly difficult to master, Moonz is a terrific new addition to the pick-up-and-play-and-curse-at-your-iPhone genre.
Moonz requires you to launch objects into orbit around Earth, the International Space Station, Mars, or Rigel-3. Keep the objects orbiting without crashing to run up your score. That's really the gist of it. Of course, with gravity doing its thing and the increasing craziness of keeping multiple objects on different orbital planes, you're bound to have objects crash and crash often. That's the curse-at-your-iPhone portion of the genre.