Yaron Goland’s thoughts on Tor suggest an interesting decentralized system…

You don’t know what you have to hide and by the time you figure it out, it will likely be too late. This is where Tor comes in. It makes it much easier to hide. The reason to use Tor isn’t so much because you have something to hide, the reason to use Tor is so when you find out you had something to hide you can rest a little easier knowing that your secret may be protected.

He has some interesting design notes about constructing a network of routers to serve this purpose.