Luna Display - Hardware that turns the iPad into a wireless second display
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Duet Display - With Duet Display, you can transform your iPhone or iPad into a second display to expand the screen space of your PC or Mac system.
Particlescape - Particlescape app lets you create stunning patterns at your fingertips.
Mountie - Mount a second screen (iPad/iPhone/tablet) to your MacBook
Fluid Simulation - Relax with beautiful, fluid particle effects that react to your touch.