Usagi Drop is a 11 episode long anime made by Production I.G. and Fuji TV, was adapted from the manga written by Unita Yumi. Some said that Usagi Drop was the best anime of this summer season 2011 and damn they are right, Usagi Drop is great.
Here is another entry for the Anime Summerseason 2011.
Kaitou Tenshi Twin Angel: Kyun Kyun Tokimeki Paradise!! is a 12 episode long anime show produced by J.C. Staff, originally based on a pachinko slot machine game.