I recommend the Spacemusic Podcast; some of the best Electronic/Ambient/Techno/etc. music.
LINKS:
Spacemusic RSS Feed (free): http://podcast.istream.info/spacemusic/prelisten.xml
Spacemusic Archive (free): http://www.podcast.net/show/33808
Spacemusic's New Podcast Page (pay): http://istream.info/INT-Spacemusic/Spacemusic.html
My futuristic music blog: nfsmusic.blogspot.com