Super Ambient or Drone-y stuff....

Brian Eno (one of the first ambient artists)
Darkspace, Paysage D'Hiver, Urfaust, Wolves In The Throne Room (ambient black metal)
 
Aeoga - Triangle of Nebula-Devourers
Solaris (Lva) - Portraits Noires
Whitehorse - Whitehorse
Mammoth (UK) - Colours: Pentapus
Mammoth (UK) - Colours: Traumascope
House of Low Culture - Gettin' Sentimental
Bibilic Blood - Z'Ha'Doom <-- New band; keep an eye out!
Aardtmann Op Vuurtopberg - Aardtmann 2.0
Black Shape of Nexus - Black Shape of Nexus
Dark Castle - Spirited Migration
Ox - Aftermath

Good luck!