Not sure how “useful” this is but it sure looks fun. The LighTalk II is a scanner and electronic LED wand combined.

To use you simply doodle on a piece of paper, scan it with you LighTalk, you then wave it and to the amazement of your friends an LED image of your doodle will appear in the air.

With version 2 of the LighTalk you can store up to 8 messages or doodles and use it’s IR feature to transmit message to your fellow wand wagglers. It’s available for under $40 from Think Geek, let the geeky doodling begin :).