Where's the "hub" in your topic niche? This tool will help you find the most powerful sites in your category (in search engine terms) so that you can make sure you are well-linked to them and thus improve your own search engine rankings. Simply enter a search term plus your URL and up to 10 of your competitors' URLs and you will receive a graph and a long list of sites that link to two or more of the URLs provided. Find out who links to your competitors and does not link to you, and your linking strategy is in place.
From Web Digest For Marketers