Just to tell you about Cock Rock Disco's free music page. There's over 300 minutes of free breakcore/idm/speed-mash-whateverthef**k-core to be had, so it's very much worth it if you're into this kind of stuff!
Particularly I suggest grabbing Dev/Null's "Necrobestial Sadobreaks". This is some great breakcore mixed with what I can describe only as cutting up a load of grindcore tapes and putting them back together in a random order. And also "The End" ep by Vorpal, there is some great ambient interspersed with the chaos.
http://www.cockrockdisco.com/freemusic.html
Enjoy!
