As you may be aware, one of the ways that Google determines where to rank a page for a particular search term is by its PageRank. This essentially rates the quality of a page in the Google index. It does this in a number of ways, one of which is the number of links to a page.
Google Blogoscoped links to a site that displays a web page with a PageRank beside every link on the page. It’s quite interesting to look at if you run your own site and are wondering how your links stack up.