This is a self-promotional post, but I think it will be useful to most of the readers. Back on July 12th, I announced the Free Google Link Popularity Analysis Tool we made available at my corporate site. Then I decided, wouldn't it be useful if this data could be stored and then looked at later. In addition, wouldn't cool graphs with link data be cool to be charted? I thought so. So I built a new product to my SEO Count Web site. So now there is a Google Keyword Reporting Tool, which I use almost every day AND a Google Link Analysis & Popularity Tool which is wild.
Some of the cool features include: - detailed link analysis (anchor texts, page ranks, ip look ups, and much more) - link comparison graphs - filtering options (by pagerank, anchor text, domains, and more) - i can go on forever.
Anyway, if your interested, check out the paid version at http://www.seocount.com/link-tool.php. It uses the Google API and here is a cool example graph.