[@Big Dread] You could run HotB. It's not complicated. You're mainly just making sure other people aren't breaking rules while they're making up the story of the game and everyone's characters (because you can change other people's characters and their backstories, too, unless they protest...and spend a...I forget what the meta-currency is called, but unless they spend it to stop you from changing their character, you can say something about theirs that's true) and whatnot.
Basically, you get to watch. It's very GMPC-friendly 'cause of that.