I think the only thing I got out of this was to reinstall SafeHistory and SafeCache for Firefox.

Even though I'm all for optimal layout of options I don't think that any website should try and go parading through my history to do so...at least not without my explicit permission.

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.