Don't watch that much anime, but my favourite so far (in no particular order) would probably be:

 

-Bleach

-Naruto Shippuden

-Highschool of the Dead

-Seikimatsu Occult Gakuin

-Full Metal Alchemist: Brotherhood

-Death Note

-Code Geass: Lelouch of the Rebellion

-Code Geass: Lelouch of the Rebellion R2

-Clannad

-Clannad After Story

 

What are everyone elses?

I'm a total otaku, I can't even count the number of animes I've watched. I have a few favourites as well, but here's the short list:

 

1. Ah! My Goddess

2. Angelic Layer

3. Azumanga Daioh

4. Bleach

5. Chrome Shelled Regios

6. Fruits Basket

7. Full Metal Panic

8. Ghost Hunt

9. InuYasha

10. Lovely Complex

11. Mai Hime

12. Naruto

13. Nodame Cantabile

14. Onegai Teacher

15. One Piece

16. Ouran High School Host Club

17. Prince Of Tennis

18. Ranma

19. Rounin Kenshin

20. Soul Eater

21. Steel Angel Kurumi

22. Torodora

23. Trinity Blood

24. Vampire Knight

25. Wallflower

 

Yikes... I guess that wasn't such a short list after alll, but I truely loved them all, this is as much as I can narrow it down.