Justice League of America
The Justice League of America is, essentially, DC Comics version of The Avengers. I think the League is best when the "Big Three" of Batman, Superman and Wonder Woman are on the team, but some of the more off-beat lineups have their moments.
As Marvel has laid out a specific movie plan culminating next month (*squee*) with The Avengers movie, DC has never really seemed to get their act together (beyond the recent Batman's which are...okay). However, their animated efforts (television shows, direct to DVD animated features) are usually phenomenal.