David Webber makes awesome sound art things from christmas trees, pot plants, household stuff, food blenders and hard drives. His good friend Ray Wilson builds awesome modular synths. Ray will also show you how to make your own Weird Sound Generator.
Len Lye: New Zealander Len Lye was a restless maverick - a pioneer of films without cameras (drawing directly onto the celluloid) and kinetic art (CD available through Atoll, sound samples here and here), and he was also quite handy with poems and inks. More about his Windwand and recently installed Waterwhirler on Flickr. Coralised open directory of short Waterwhirler movies here.
Let Them Sing It For You. Alternatively, you can Låt dam sjunga det åt dig. Also, a tree with birds in it, and Sound Carpets. Potentially lots more sound fun at the Swedish Radio page, although the exact quantity of fun you'll have depends on your ability to speak Swedish.
Making music entirely from non-musical things: McDonalds Happy Meals, Henry Kissinger, Bread, Salad Tosser, Fluorescent Lamps, the Bible, Hearts, Dot Matrix Printers, Photocopiers, Volkswagen [possibly nsfw], The Postal Service, Blank Tapes, Eiffel Tower, Deportation Orders [scroll down], Cakes, Cucumbers, Furniture [scroll down to #12], Skin, Roads, Underpasses, Frogs, Vinyl Run-Out Grooves, Radios, Natural Geophysical Phenomena, Carly Simon and other stuff.
Window Standpoint. If you've ever wondered what international sound artists see and hear when they're at home, staring out of their pokey apartment windows and watching the world go by, then this is the site for you.