What are some of the less-known and interesting public APIs and frameworks that I can use for iPhone? In OS 3.0 they're supposed to be 1000 new APIs more than in 2.2, so which one of these are the most interesting and not so well-known?
There is the screen capture function that the newly approved streaming video iPhone apps are using. Though, normally its use would be prohibited (private API policy), Apple changed its stance on this one in particular.
CGImageRef UIGetScreenImage();