I think this is the kind of thing that Ulises was talking about in his paper Distributed Textual Discourse. It’s pretty exciting.
Basically, wikalong is a firefox extension that sits in your sidebar and allows you to effectively annotate each page you visit AND see everyone else’s annotations.. pretty cool huh.
So, if you install this and you’re using Firefox you can visit this blog and say what a jolly great read it is! Interesting stuff.
A couple of things I’d like to see would be for it to run in the status bar with optional pop-up (sidebar is too big)… maybe as a ticker… and a bit of a spam blocker would also be cool.