Sonic Mayhem (look 'em up on the web; does guitar-oriented industrial/techno usually for video game soundtracks)
Front Line Assembly
Ministry
Generated X-Ed (good luck finding this one, but they are AMAZING for this genre)
For the Eastern vibe of Asian Megacorporations and such, check out Lumin, Vas and Delerium...mostly ambient electronica and "Eastern" style vocalizations
Animatrix soundtrack has some really hot tracks
Spawn soundtrack
DO NOT FORGET ABOUT RAP/HIP-HOP, especially the more militant stuff. Great inner-city feel, which is perfect for the Sprawl. Certain acts have a lot more electronica than you'd expect, too, like Busta Rhymes.
Aphex Twin
For a horror feel, you can't beat the Event Horizon soundtrack (Michael Kamen w/ Orbital)
I think I repeated some stuff, but otherwise, everyone else mentioned some really great stuff.