I've been pretty much listening to a lot of Japanese indie rock for the past few months and I have to say I love what I hear. I figure if these bands are this good I should spread the knowledge or at least post the link to where I find out about most of these bands
http://www.zbsatozofjmusic.com/Anyway that is the link to the greatness which is Japanese indie rock as well as some of your mainstream J-Rock bands. It's not a torrent site it just gives you info about these bands such as new albums and what not.
also a few of my favs right now
Molice
rejuvenated half-face
midori
Lite
9mm Parabellum Bullet (there like an AKFG cranked up to 11)
School Food Punishment
and the list can go on but i'm tired of typing