Just looking back a few pages, here's the running games in Advanced that seem to be Superhero-related. I didn't dig very far, but at least one of these should still be active.

[url=http://www.roleplayerguild.com/topics/23401/posts/ic]Super Hero RP[/url]
[url=http://www.roleplayerguild.com/topics/236/posts/ic]Universal Comics: DC - Shadows Among Us[/url]
[url=http://www.roleplayerguild.com/topics/1188/posts/ic]All-Star Marvel: Age of Heroes[/url]
[url=http://www.roleplayerguild.com/topics/705/posts/ic]Ultimate One Universe: Marvel/DC RPG[/url]
[url=http://www.roleplayerguild.com/topics/25703/posts/ic]Independent Comics Universe RPG[/url] 

I found one related int chk as well:
[url=http://www.roleplayerguild.com/topics/26122/posts/ooc]New DC Comics RPG[/url]