Gackt
Ellegarden
Nightmare
the Gazette
L'arc-en-Ciel
Dir en Grey
Linkin Park

School Days if you're really into drama and intrigue.......
Shigurui is a samurai-type anime base on realistic occurrences...its bloody
Also check out Claymore and Darker than Black that were previously listed...really good stories..

For comedy:
Seto no Hanayome, Nagarasette Airantou, Hayate no Gotoku, and I guess Zero no Tsukaima

It's a steady series but needs more detail on the members' pasts..

I like it so far so I'll continue watching it.

Hmmm I've always wondered that as well...
Amber seems too "open-hearted" while C.C. has a more reserved side...revealing things only when the time is right..
I know Clamp made the character designs for Code Geass but unsure about the artists for Darker than Black. :/

Wow....I didnt think it was that bad judging from the previous comments...

Ummm well, we can all use some laughs I guess