[ultramancool]

I've been thinking about how something like this could be done in a completely distributed way, I think I've even seen some research implementation of it. In any case, it'd be interesting...

Hmm... http://twister.net.co/ maybe? The biggest issue is going to be mobile, but if you have enough people firing it up on servers and stuff, you'd probably be okay. And then of course you realize that there's also the even bigger issue of actually getting people to use it. You're fucked there unless you have some serious marketing talent, which most people capable of writing such a thing in the first place lack.