Wow, this is great idea for a startup. Is someone already doing/done this? Peer-to-peer user tracking. Like those crappy toolbars of yore, but all server side.

Wow, this is great idea for a startup. Is someone already doing/done this? Peer-to-peer user tracking. Like those crappy toolbars of yore, but all server side. Sign up, put our random-URL-sampler-JS block in your page, and you get access to all our mined data.