It will be tough for me to contribute to this thread because ...I have too many suggestions. For over 13 years, I have been listening to SomaFM's Groove Salad. Via GS, I discovered the brilliant minimalism of Aspen, the atmosphere of All India Radio [EDIT: URL got munched] (my most listened-to artist on last.fm, with over 5000 plays), the synth pop of 2raumwohnung and a legion of others.
This was the song I heard on Groove Salad that got me in to 2raumwohnung.
https://www.youtube.com/watch?v=jofp9zDbTF0