http://www.tuaw.com/2008/07/28/torque-game-engine-comes-to-the-iphone/
We've mentioned the Torque gaming engine from GarageGames here a few times before -- it's a pretty powerful 3D engine that makes developing great games on the Mac that much easier. And now, they've released a version of it for the iPhone, complete with support for multitouch input and even screen gesture recognition.