- TV Shows
- Batman: The Animated Series
- Superman: The Animated Series
- The New Batman Adventures
- Batman Beyond
- Justice League
- Justice League Unlimited
- Films
- Batman: Mask of the Phantasm
- Batman & Mr. Freeze: Sub Zero
- Batman Beyond: Return of the Joker
- Batman: Mystery of the Batwoman
Static Shock, The Zeta Project, and some online flash cartoons are also a part of the continuity, but I don't care about those.
But all the above things are awesome (except for maybe Mystery of the Batwoman, 'cause I haven't seen it yet), and made even more awesome because they all fit together in the same continuity. From Batman: TAS to Justice League Unlimited. It's all related. Everything that happens is canon to the story. And all the shows and movies are just great quality, well-written, and very enjoyable to watch.
Like the title says, I believe that the DCAU is the greatest animated continuity ever. This tops your silly anime series and your seasons of Family Guy and The Simpsons and blah blah blah. I don't think anything will ever beat it.
I will make it a goal to someday legally own every part of the DCAU...but I guess I'll wait 'til I get a Bluray player and wait for all these shows and stuff to be released on Bluray. :P