Winter 2010/2011:
http://www.fansubwiki.com/Who_Subs_What:_WINTER_2010
Spring 2011:
http://www.fansubwiki.com/Who_Subs_What:_SPRING_2011
Summer 2011:
http://www.fansubwiki.com/Who_Subs_What:_SUMMER_2011
Fall 2011:
http://www.fansubwiki.com/Who_Subs_What:_FALL_2011
My favorites would be:
Gosick 1st ED:
http://www.youtube.com/watch?v=YhffJ5OEIfM
Deadman Wonderland OP:
http://www.youtube.com/watch?v=6q6_O0h78cM
Mirai Nikki OP:
http://www.youtube.com/watch?v=ql0NtjXIv_s
Those were about the only three that stuck out in my mind this year. I've replayed the first two many, many times. I can't remember too many others.

Anyone have a favorite that they've seen?