Ngmoco (short for "Next Generation Mobile Company) used to be my favorite iPhone developer, their classic games like Rolando and Topple defining the golden age of iOS gaming.
The Tetris-like Topple with its physics-based twist is particularly interesting: the game has you balancing and stacking playful blocks using multitouch and accelerometer controls.
After a long hiatus, the sequel to Topple, Topple 2, has been revived from the archive and re-released on the App Store. The new version, in addition to supporting the iPhone 5's taller screen, includes 30 levels scattered across six new worlds, while enhancing the experience with four new game modes, head-to-head multiplayer, Mobage social game network support for online leaderboard, game progress synchronization across devices and more...