Skinny Puppy has been my favorite band for several years, followed by Pet Shop Boys. Other favorites include David Bowie, Sparks, Nine Inch Nails, Coil, Chemlab, Prick (and Lucky Pierre), blah blah blah. I mostly dig industrial, metal, and synth pop.
Lately I've been revisiting two of my metal favorites, Sigh and Solefald, both avant-garde metal bands which started out as black metal (although even Solefald's earliest stuff was heavily experimental and different from the norm). Love them to death. The early Black Sabbath is my favorite metal band, though. I adore the first six albums.