I've been a big fan of the DCAU (DC Animated Universe) since day one. The Batman: Animated Series was the best after school cartoon I can remember (Aside from Teenage Mutant Ninja Turtles, and X-Men: The Animated Series). DC jumped into another stratosphere when they started making their direct-to-video/DVD animated films. My favorite of the films is probably Batman: Under the Red Hood, but its really tough to choose as almost all of them have been so great. Their latest release, Son of Batman, is an adaptation of Grant Morrison and Andy Kubert's 2006 Batman and Son storyline. A loose adaptation at that, the film veers a bit from the source material.