E Ink, the display tech used in the Amazon Kindle, is a practical choice in a lot of devices. Since it only consumes power when you refresh the screen, it could theoretically replace a lot of products based on paper. This E Ink Electronic Coach Playboard from designer Gordon Yeh is a good example.

Just a concept right now, the Playboard would come preloaded with templates for various sports — from basketball courts to soccer fields. Blow the whistle, gather the team around, and plan the next play by drawing with your finger. Having the ability to save drawings gives it an advantage over your typical whiteboard. Nice idea, as long as it doesn't run out of power of break in the middle of a game. You might still want to keep that mini whiteboard handy.

Via Yanko Design