Here’s a nifty little trick. Install my iPhone utilities package. Then cd into /System/Library/CoreServices/SpringBoard.app. Then issue the following command:
restart; ./SpringBoard. This lets you run SpringBoard from the command line and peek at all its NSLog messages as they are issued.
Be aware that this is not safe, your stuff won’t work right, and you’ll surely have to reboot after. But it’s still kind of fun in a power-tool way.