LinkRanker
View the PageRank of your backlinks
This tool gets the top 50 inbound links from Yahoo's SiteExplorer API, and sorts them in descending PageRank order.
This tool is therefore useful for competitive link analysis, and finding out what top authority domains link to your site. It does not currently take into account nofollow links, but does highlight well-known nofollow domains such as Wikipedia & Delicious.