When it comes to techno-esque songs, I'd recommend Taku Takahashi. A lot of his stuff on MySpace and YouTube is remixes of pop songs, but he also composes most (if not all) the music in the anime 'Panty & Stocking with Gartebelt'.
Also, Renard is an artist who branches out drastically in terms of electronic genres. He uses several different personas to represent what genre of music he's doing. Does everything from Happy Hardcore to Dubstep, and he was pretty much my gateway to good music. He's also Pro-Piracy which makes him such a G. B)

I pretty much can't speak for anything else since I'm a music hermit.