Sniffing the Browser History

Another geeky one, this time a blog post about how a website can tell what other sites a user has visited.

The method depends on the fact that browsers show visited links in a different colour than unvisited links. The technique uses JavaScript to create a page (that you never see) with a bunch of links, then checks to see which links are in the visited colour. This seems to mean that he can only check if you've been to a specific list of sites rather than seeing the whole list of you've been. He has a demo page if you want to see it in action.

via 43 Folders