just posted The Night Lights in the 'listening to' thread and then saw this thread. been playing in the background all day and haven't gotten tired of it yet...
Robert haig coxon, michael logozar, secret garden, yanni, liquid mind, 2002, Dan Gibson. All of these folks are spectacular. My favorites are secret garden and Robert haig coxon.
Slow Dancing Society (Love this track).
Stars of the Lid
Jon Hopkins - Opalescent
Harold Budd & John Foxx - Drift Music Hammock
Mooma (Go download his excellent free album Herd Forming here)
Markus Guentner (he does techno also, so make sure you pick his ambient works. Most of that gets released on the annual Pop Ambient series).
Eluvium
Robert Rich (Check out Somnium a 7 hour long continuous piece).
X3. I love his music. Somewhat similar is Washed Out
Some of Jean Michel Jarre's work is ambient (Oxygène is good); For true ambient, atmospheric music I have a bunch by Andrew Lahiff I downloaded free from ArtistServer that I really like. Also, Brian Eno's Apollo is a good ambient/atmostpheric album.