Hmm. Heres an idea I've been punting down the road for a while now - an RPG campaign, but instead of being a unified party, its basically a bunch of semi-solo campaigns that diverge and intersect. Kinda like comics books in a shared universe that keep having their characters join up and diverge. It's have to be online play by post though, obviously. XD
@sl2c Yeah, I'd probably use GURPS or roll my own system if I wanted to do this. XD