And the winner is:
Besides having a stellar year with dozens of articles showing bias in the New York Times alone (and forcing many corrections), CAMERA also freely released its monograph on that paper detailing its bias during 2011. They were in the forefront of identifying systemic Christian anti-Zionist trends. And they also oversee their fellow nominees, the excellent CiFWatch and BBCWatch, as well as Presspectiva and a couple of other specific sites for Spanish speakers and college students.
Congratulations, CAMERA!