Jane on Game Girl Advance mentioned an April, 2008 release party for Tenori-on, a new tablet / drum machine / sequencer-like instrument designed by Toshi Iwai for Yamaha:
J-Fav, can I have ten of these, to go with the DS that Iwai-san signed at SIGGRAPH? Hmm, it looks like it's only sold in shops in the UK. Over 600 Pounds? Yikes!
I think it would be fun if you could play "go" on something like this, too.