Burial, μ-Ziq, Aphex Twin, Boards of Canada, Squarepusher, Autechre, Four Tet, Venetian Snares, Access to Arasaka and, lately, Skee Mask.

Also really like dungeon synth sometimes (Erang, Dargaard, Depressive Silence). If I'm doing something that doesn't require a lot of attention, I might listen to some black metal (Wolves in the Throne Room, Panopticon, Falls of Rauros, maybe Immortal if I'm deeper than my third cup of coffee).