Playground for gesture recognizers. Might rule. Might suck.
Here it is in action:
Tap-and drag in the "Gesture Here" area. Anything logged by the program, such as NSLogs from the gesture recognizers, gets put into a scrolling text field. The active gesture recognizers are on a timeline at the top.
When you're done tapping and dragging, you can replay the events by dragging around in the timeline, seeing the different parts of the getures being drawn, in a different color for each finger/drag combination.
Got a recognizier firing early? You can see what the tap-track looked like that might have confused thing. Ever wondered what a cat print looks like? Start this running and let a cat walk across the iPad.
A description of the logging hijacking will appear on the Big Nerd Ranch blog.