Here are some interesting links (we are not responsible for the content over there):
Boards of Canada - Ambient/Electronica Band
bocpages.org - unofficial BoC wiki
BoC - archived site with audio/visual interactive flash
Dälek - experimental Hip-Hop Band
FOEM - A/R and production community
IDM Forums - electronic music community
AudioRealism - Home of ABL3, the best 303 VSTi out there
SonicCharge - Home of the great µTonic Drum Synth
Audio Damage - Home of many great, affordable VSTs
SmartElectronix - a bunch of crazy, free VSTs
Karma FX - Home of the great KarmaFX Modular Synth
rekkerd.org - the best blog about anything related to music production
Analog Industries - a great blog about music and other stuff
Sennheiser - Microphones and more, be sure to check the e965
Nicolas Wiese - Audio/Visual artist from Berlin
Schanze 12 Studio - recording studio in Hamburg (Germany)
Soulfire Hi-Fi - Dancehall/Dub Soundsystem from Kiel (Germany)
Audiotool - complete online music studio