Love or hate Girl Talk (or, not know what the hell it is) Mash-ups are getting popular these days. Kids & Explosions is... Different. It's beautiful. Listen to the track above... One of the best Sigur Ros tracks with a depressing suicide note by Biggie laid over the top, spiraling into a chorus by Rhianna... It's just so amazing. CD is free, too.
Seed of Ignorance - The Humanix
I The Breather - Forgiven
U2 - Breathe
Mastodon - This Mortal Soil
Daft Punk - Derezzed
The Fall of Troy - Macaulay McCulkin
Five Finger Death Punch - Bulletproof (these guys are so fucking cheesy but once you get into them some of their songs can be very enjoyable, like this one.)