I recently picked up an iTouch in the hopes that the programming community would be as wide and alive as the PSP's, but so far, I can't help but believe I was terribly wrong. With all the potential for great apps out there, is the best there really is is a shoddy clone of Tetris and pay-as-you-go Sudoku? There must be more!
What are your killer apps, homebrew or otherwise? Or at least where do you go to keep on the edge of news for the iPhone/iTouch?