Chopper's been in the App Store since day one, and David Frampton of Majic Jungle Software is the guy who put it there. Since then it's garnered over a million downloads, he's made a number of other App Store titles (and brought the game to the Mac), and he's hard at work on the game's sequel. We've actually posted it here on TUAW before (more on that implementation in just a bit). but I got to go hands on with the game on the iPad at WWDC.
As a game, it plays about the same as the first one -- you control a chopper across 36 missions in 12 different locations, doing things like blowing up enemies, rescuing hostages, and so on. But the intriguing part of the game is the control scheme -- while it uses the same tilt-to-fly method as the first one, the fire button isn't on screen any more. Instead, you just touch anywhere to fire, and then adjust your finger on the screen to aim. It's amazingly intuitive -- the lack of a UI solves the problem of graphics getting in the way, and Frampton's figured out a great balance of skill-based aiming and touch-anywhere-to-fire.