According to poll from internet provider, Biglobe, Puella Magi Madoka Magica was voted by fans as best anime of 2011. Mahou shoujo anime by Shaft gathered 543 out of 8,808 votes to grab the top spot.

Synopsis
Beloved family, good friends, laughter and tears – these things make up the ordinary life of Kaname Madoka, a second year student of Mitakihara City Middle School. One night, Madoka dreams of a mysterious dark haired girl struggling against a terrible evil; the next morning she discovers that the girl, Akemi Homura, has transferred into her class. This encounter will lead to an incident which will alter Madoka’s fate forever. [MAL]

Rankings:

1. Puella Magi Madoka Magica
2. Ano Hi Mita Hana
3. Working!!
4. Dog Days
5. Hanasaku Iroha
6. Nichijou
7. Boku wa Tomodachi ga Sukunai
8. Baka to Test II

Baka to Test

9. Ro-Kyu-Bu!
10. YuruYuri
11. Tamayura -hitotose-
12. Ika Musume
13. Natsume’s Book of Friends
14. Infinite Stratos
15. Hidan no Aria
16. GOSICK

Gosick

17. Blue Exorcist
18. Ben-to
19. Ikoku Meiro no Croisée
20. Chihayafuru
21. Mashiroiro Symphony
22. Mayochiki!
23. The World Only God Knows

The World God Only Knows

24. Denpa Onna to Seishun Otoko
25. Heaven’s Memo Pad

[Source]