Chairman Of The Bored, one of the eminent musicologists at the Sonic Youth Gossip Forum, has shared a link to a webpage that makes your keyboard into a drum machine. Get yr drum on here. Hitting "V" and "N" back to back repeatedly can hypnotize you, for it sounds like a party in George Michael's bathroom.
Not to be outdone, SpectralJulianIsNotDead has posted a link to a website of Harry Partch's instruments. Harry Partch created many instruments to fit the compositions he had written, including the Chromelodeon, which had 43 tones in a single octave. Play the instruments here. You can also hear Mr. Partch describe his instruments and hear pieces of his compositions.
In a slightly different vein, Sonic Youth 37 has posted a link to a pretty kick-ass flash animation of Japanese head-banging drummers called DRUM MACHINE by TokyoPlastic. Click here to enjoy. Some bad-ass shit.