Hideka Naganuma is an awesome composer who is mainly known for doing a ton of great tracks for Jet Set Radio and Jet Set Radio Future
Tracks such as
However, he's also done quite a bit more than that. He did the OST for Ollie King, a little known arcade game.
The soundtrack for Sonic Rush on the DS
As well as several other games that I'm going to get into right now, though he did just recently do a new song for Lethal League Blaze. In response, the game has a character in it who looks like she could've come out of the JSR series.
So yeah, I love the hell out of his sound, the hyperfast/hyper-Japanese style of it, mixed with a heavy techno influence. His songs sound like his songs, and I love that.