MaKey MaKey Almost anything's a keyboard

Well, anything that's even a bit conductive that is.

This is a seriously cool gadget, Arduino based and developed at M.I.T., MaKey MaKey connects via USB to a computer and lets you build touch pads or keyboards out of bananas, modelling clay and even people. 

MaKey MaKey Mario
Flikr: CC-By-NC

Like the conductive "Squishy Circuits" from a couple of years back this looks like a great way to interest young minds in electronics.

More information and how to get one (US$ 45 including shipping) at their KickStarter page or read more at their own project page.They also have a Flikr set of their own projects.

At the time of writing there are more applications on the KickStarter page than the others but I guess that will change over time.