There was an episode of Arthur (cartoon, PBS) that featured a character officially with Asperger's. The 15min long episode, titled "When Carl Met George" can be seen from the links below (via YouTube):

Part 1: http://www.youtube.com/watch?v=HiJDdg6BDXk

Part 2: http://www.youtube.com/watch?v=TYgN2few-Tw

I liked how George was portrayed as different, not with a disability.