I have this weird enjoyment of songs/music that actually sounds like it was made with machinery.
Trent Reznor has made a couple, not counting "At the Heart of it All" (which I posted in the last music thread and which he didn't actually write).
Less well-known is this song, done for the release of Tetsuo: The Bullet Man
This leads me to the guy who's pretty much the master of this stuff, Chu Ishikawa. He did the soundtracks for various movies, most notably Tetsuo: The Iron Man, a Japanese body horror/cyberpunk movie from 1989. The movie itself is pretty fucked up, but the soundtrack is amazing.