If you thought a boogie board was a salt-water vessel that lets you skim the waves, think again. Improv Electronics' Boogie Board is a pressure-sensitive tablet that uses a watch battery for power. It's like a digital blackboard!

The Reflex LCD doesn't need any power to keep the scribbles and drawings on the screen, with the watch battery only being put into use when the screen is erased. The watch battery will last for 50,000 erases, which makes the $29.97 board cost 15 times less for each erase than a normal sheet of paper. It's ideal for kids, or perhaps artists who care about the long-term saving associated with the Boogie Board. [Improv Electronics via CrunchGear]