Unity. I've never heard that name before, even it flashed few times before my eyes while loading few games on iPhone. Well, "Unity is a multiplatform game development tool, designed from the start to ease creation. A fully integrated professional application, Unity just happens to contain the most powerful engine this side of a million dollars."

What can you do with Unity? A game. For web, Wii and... iPhone. Take a look at these great demos at their website. They also have some good pricing schema.

More info: http://unity3d.com/

You can also read interesting interview with David Helgason, CEO of Unity Technologies here: 

http://area.autodesk.com/index.php/stories_bts/bts_detail/unity_ceo_david_helgason/