Atari has released Missile Command for the iPhone, and after a weak of playing it I can say it is easily the best game available in the App Store. The game play is exactly as one who had played the game would expect: Tap on the part of the screen where you want the missile to go and whoosh, off it goes. Incoming ICBMs, bombers, spaceships, and the difficult to kill pink diamond are what you're protecting your cities from. The game is a perfect port with the three missile launchers and the six cities. There are two modes: classic, for that totally '80s feel, and Ultra, a 21st century upgrade with tremendous graphics and futuristic cities and moonscapes. The graphics are amazing for a cell phone game, with realistic smoke and explosions. Sound effects are excellent, with a helpful warning when your silo is running low on missiles. The music is decent, but if you don't like it you get the option to listen to you iPod tracks. This is such a good idea it should be standard every app from now on. There are lots of options in regards to difficulty and sound as well.
All in all, this game is a blast. The price is fairly reasonable considering the high quality of the game. Do yourself a favor and download Missile Command for the iPhone, you won't regret it.