Because I've thought for a while that we need one.

To get it started, my favorite anime series as they seem to me at this very moment:

1. Paranoia Agent
2. FLCL
3. Azumanga Daioh
4. Cowboy Bebop
5. Neon Genesis Evangelion
6. Excel Saga
7. Samurai Champloo
8. Boogiepop Phantom
9. GTO: Great Teacher Onizuka
10. Ebichu Minds the House