Mundungus (Found it through Miranda July)

    Sonus - collection of over 1500 peices of composer-contributed music hosted by CEC

    Zavoloka - Ukrainian Ars Electronica Prix winner 2005 - has a couple of CD's on her site.

Interactive

    Cut and Splice: Dots and Lines - a curated BBC-hosted site with interactive on-line sound art thingies.

    soda

    soundtoys

Alorithmic

Rob Wright's Wind Chime Marimba - a disarming peice of algorithmic composition where you get to "see the engine".