This isn't so much a single tool, but a site with a lot of tools on it. As with most sites this one has tools that are good, and perhaps not so good. I discoverd this whilst doing a search on Google for "pagerank datacenters". I had heard that Google was exporting new PR data again and wanted to see if ahb Solutions had been affected.

The tools on this site are well laid out and nicely presented, and they work.Go on give them a try. Oh, I better tell you what the site is it's http://www.linkvendorr.com.