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
@Angle Amber Diceless (and its numbers-filed-off successor, Lords of Gossamer and Shadow) do this pretty much automatically. Especially if access to communication is limited.
@Angle I think that could work reasonably well with the right system. D&D or even Dogs in the Vineyard would be really rough but I got pretty close to that with the Sorcerer campaign I ran