The Touch Board arrived on Kickstarter last week but it's still worth taking a look at

Bare Conductive bring us the Touch Board which is already fully funded on Kickstarter ...

Now anyone can transform touch into sound (and so much more!) with the Touch Board, an easy-to-use Arduino-compatible device.
What is the Touch Board?

The Touch Board is a tool to make your projects interactive, responsive, smart or just fun. Use the Touch Board to change the world around you by turning almost any material or surface into a sensor. Connect anything conductive to one of its 12 electrodes and trigger a sound via its onboard MP3 player, play a MIDI note or do anything else that you might do with an Arduino or Arduino-compatible device.