James Marsters, formerly known as Spike on Buffy or Angel, has his own band called Ghost of the Robot. They've been around for a few years, but no one really knew about them. They're not really hardcore or anything, just good music to sit down and relax to. Theyve toured all over the world and you can check out their site at Ghost Of The Robot
I found a lot of their songs on WinMX, but theyre mostly live recordings, which sound kind of scratchy but its pretty good stuff. I found 1 studio recorded song, called Mefiant. They have 1 album out (Mad Brilliant) and theyre working on another.