Look at this one
http://www.anarchestra.net/
or
http://www.baschet.net/front.htm
or
http://www.oddmusic.com/

Some people think the way forward is by changing the tools

Given my plug in the "what are you listening to thread", I may as well mention Robert Rutman's Steel Cello here as well.

yeah, that's true (that can be heard a lot on svefn-engular, among many other tracks)

Led Zepp. did that back in the day too

I also forgot to add the other related artist I've been listening to lately to this thread: Animist Orchestra. They're essentially a free-improv group using natural objects exclusively. Pretty cool.

http://www.davidstanford.com/jerman/animist.html

Roivas might be interested in their method of notation, when they bother doing so:

Yeah, I like that.

See if you can find this Gardner Read book somewhere at the library. Tons of info and sources...lists the techniques and several composers who have used them...lists the pieces as well.

Compendium of Modern Instrumental Techniques:

http://www.amazon.com/exec/obidos/tg...books&n=507846

Solmania chap's customised guitar.

The first two people that come to mind are Henry Cowell and John Cage. Cowell for his unique piano playing (inside of the piano), and Cage for prepared piano. Maybe they're too obvious, but I didn't see them mentioned yet.

Other than that, I don't know if anyone has ever heard of Paolo Angeli (i think that's his name). He invented a guitar-type instument that he plays similar to a cello. Besides picking and bowing the instrument, he also rigged foot pedals with mallets that play the strings like a piano.