There are hundreds of SEO tools out there, we have covered just a few. I recently saw a short thread with a person complaining his site has been removed from the Google index. In the Google Webmaster Help thread, a top contributor suggested they use a tool to see if they are linking to bad sites and getting links from bad sites.
The tool was built by Michael VanDeMar and can be accessed at bad-neighborhood.com/text-link-tool.htm.
I am not sure how accurate it is, but it is just one more of many link tools to help you analyze the health of your site's linking strategy (or lack there of).
Forum discussion at Google Webmaster Help.
