1. Mawaru Penguindrum
2. Fate/ Zero
3. Wandering Son
4. Usagi Drop
5. Puella Magi Madoka Magica
I am so far behind it's barely funny. I'm probably going to wait until the end of the year to answer because right now 3 of my 5 answers are "season 2s". Since, I'm having to stretch to come up with 5 for 2011, I know I need to see more before I make even a partially educated attempt.
I haven't watched a whole lot of anime this year and there was a few anime I began watching that i got lazy with(but i still want to go back and watch them).
2. Hunter X Hunter
3. Guilty Crown
4. Deadman Wonderland - I only saw about half but I will go back and finish it at some point.
5. Steins; Gate - again only saw about 6 episodes...I want to finish the series at some point.
1. Ano Hana
4. Hanasaku Iroha
Question, is it allowed to nominate long, still-on-going series like One Piece? I mean.. technically it's airing in 2011. It's just it's not finished yet and started airing over 10 years ago. I still wouldn't nominate it just because I'm not that far into One Piece where I'm watching episodes that aired in 2011, but I'm sure there is someone out there who wants to nominate it. :\
Honorable mentions: Bunny Drop, Mawaru Penguindrum, Persona 4
Things I wish I could have checked out: Level E, Bakuman, Blue Exorcist, Denpa Onna, Fate/Zero, Future Diary, Last Exile: Fam, Natsume's Book of Friends, Un-Go, Working.