Blue Mars is absolutely the BEST ambient stream ever. When I was unemployed I used to listen to it for hours every day - then came CARP, and the station went off the air. For two years afterwards, the website remained up showing that ominous "0 listeners" indicator.
While moving some monitors around I noticed I still had the bluemars website bookmarked and on a whim checked it. Lo and behold, the station has been back since this summer, and has actually added a third stream.
This is fantastic music to have in the background while doing computer work - and since it is an independent station and not going through live365 or some such, there are NO commercials or interruptions.
You MUST give it a listen - this is absolutely the best internet music stream ever.