some notable j-rock anime opening themes:

"Go!!!" - Flow (aka Naruto Opening #4) Instant classic.

"Raison D'etre" - Nightmare


Quote Originally Posted by Lemur
Newer stuff:

Brakes, All Night Disco Party (this song rocks harder than you think)

-edit-

Quietus, what the heck? Only one of those songs is even vaguely rock. I mean, I love the Junior Wells clip like crazy, but it ain't rock. Wilco, I guess, is sort of rock-ish.
I thought AdrianII was looking for the same upbeat stuff on his link (nevermind ZZ Top or "teh Boss".)