Wasteoid is a powerviolence/grind favorite of mine. Check youtube for lots of live videos, like this one:
Interesting news is developing in the wake of my review of the Source anthology. It looks to be a lot of work, but something really amazing might come of it. We'll definitely be talking about it some more. And anonymous commenter: I noticed your last comment long after you submitted it--it ended up in the spam filter. Please do get in touch if you'd like.
And a quick mention that Dreamachines are available in a semi-DIY fashion from Important Records right now--for folks in the UK, it looks like you could order them directly from their source at 10111.org as well. They're modified to work w/45 RPM turntables, instead of the old 78 RPM designs. It's getting tough to score old turntables that can accommodate 78 RPM! I've been making and using Dreamachines for years, though mine have always been pretty ugly, ghetto affairs. I took my time carefully cutting out the pattern on this new design, though, and I love it! It works wonderfully, and it makes an evocative art piece as well.