Remember the Samchillian Tip Tip Tip Cheeepeee - the crazy looking MIDI keyboard system built from a hacked, painted ergonomic QWERTY keyboard? Eitan Shefer, an industrial designer from Jerusalem, liked the concept so much that he redesigned it as his final year project. He's made a really great video [google video link] which explains the whole thing, including the relative keyboard layout - you don't press a key to get a specific note, but to get one relative to the note playing at the moment. Great for widdly guitar solos, not (I think) so great for chords. Full details of the project are on Eitan's website. Also on the Samchillian tip (ha!), this page has some interesting videos of Leon (the inventor) playing a $$$ Yamaha Disklavier grand piano with the Samchillian.