I have a few ambient bands I enjoy, but some might not call them ambient? Anyway, here's a few of my favorites.
Easily Embarrassed - My favorite of the type. Songs like "Time Holes", "Little Trees and Mysteries", and "Final Hope, pt. 2" really must be heard. These tracks, at least, really carry me away.
Solar Fields
Bluetech
Empusae (I became a fan when I heard Big Lebowski samples in a few tracks haha)
I guess they're "electronic ambient" or "Chillout" (meh)?
I don't really care too much for
Altus, but it's certainly up someone's alley. Lot's of free material on their website.