We just came across this neat Layer Tennis iPhone app called Layer Freak.If you're not familiar with Layer Tennis, go check it out at Coudal's site. It's a well established way of designers pinging Photoshop files back and forth, adding visual twists and turns as they go (seems to have become a bigger deal with Adobe's involvement). Anyway, the app is a great way to checkin now and then with how the season's progressing and relive great moments in previous seasons. I always thought that Layer Tennis was good example of how a simple, working collaboration work: exploring new areas and perspectives simply by adding additional elements along the way and seeing where it takes you. Obviously not very objective-orientated but certainly allows for surprises.

Check out Layer Freak via iTunes.