Physical computing with BitDJ
Fire Arduino pins as you tap the screen. BitDJ allows for looping of a tap sequence and playback- attach it to a PowerSquid for a custom light show or use it to fire pins and test any other shield.
You might also have discovered that if you boot up BitDJ, you can go to the system menu and turn on inter-screen fading (which looks really cool with the hardware in-out soft fading, kind of like an Apple laptop’s pulse button).
I’ve uploaded the rest of the TouchShield’s built-in commands are over at the function reference wiki.