I'm lazy, so I just guess this much.
*In alphabetical order*
Air Gear (Simca Emblem, on the right side of the pic.)
Bleach (Obviously Kon, and the magazine on the floor.)
Chobits (It's Sumomo)
Clannad (Dango Family drawing on the wall.)
Claymore (Rank symbols scattered around.)
Code Geass (Zero Mask)
D.Gray Man (Timcanpy)
Darker than Black (Dat mask. What is it with awesome cool characters always have a mask?)
Death Note (Death Note manga. Apple.)
Detroit Metal City (Poster on the wall)
Digimon (Haha Patamon)
Doraemon (And lot's of it.)
Dragon Ball (Well, Dragon Ball.)
Fairy Tail (Wake up Happy, you lazy blue furry.)
Fruit Basket (Kyo, dat orange cat)
Gurren Lagann (Symbol)
K-On! (They're on the friggin' TV)
Katekyo Hitman Reborn! (Reborn hat)
Kuroshitsuji (One eye guy with an eye patch sitting on a chair)
Mahou Shoujo Madoka★Magica (Dat red eye creature.)
My Neighbor Totoro (Studio Ghibli poster)
Nana (3 Manga)
Naruto (Too obvious.)
Natsume Yuujinchou (Nyanko Sensei!!!!)
One Piece (Straw Hat)
Pokemon (Pokeball)
Sailormoon (Those cats.)
Soul Eater (Soul Eater logo)