I think I'll check out:
Dance in the Veampire Bund (Come on Shaft)
Durara
Katanagatari
Qwaser
Nodame Finale
Chu-Bra (LOL)

Maybes:
Omamori Himari
Ladies vs Butlers
Hidden God

It seems like most of these have a preexisting manga or novel sources to draw on, what ever happened to original content anime