My 5 YO DS likes a lot of Playhouse disney shows...Imagination Movers is the new favorite, also Handy Manny and Tigger and Pooh. He also likes Dora/Diego, and the Backyardigans (my personal fave of all the kiddie shows!).
The only real "grown up" thing we have let him watch is Star Wars (Episodes 4, 5, and 6). I have been pretty picky about what I'll let him watch on TV and sometimes I regret that one.
It's funny now, because he'll see something at the video store (say, the Increditble Hulk) and he'll point it out and tell me that it's not "appropriate" for him...he knows I won't let him watch just anything.