BEST ANIME EVER!
For me, it's 2x2 Shinobuden.
I just finished watching it. The last episode made be cry, but because of sadness so much, but just because I knew there was no more. Seriously, how can Genius things like this only go for 12 episodes and things like Naruto get HUNDREDS of episodes.
anything Tengen Toppa Gurren Lagann or evangelion
Bokusatsu Tenshi Dokuro-Chan!!
Haibane Renmei
Boogiepop Phantom
The Big O [1-13]