Bob Mutch at SEO Company created an inbound link quality extension for Firefox. You can download the extension from his home page, or access the tool online (again on his home page, but the web based tool has been slow). The tool checks to see if a site is listed in the Yahoo! Directory or DMOZ. In addition it searches Yahoo! for the number of .edu and .gov links pointing at a website.
The extension looks like this
While in some cases there are some .edu and .gov sites that offer up spammy links, the theory behind the tool is that most .edu or .gov links are going to be harder to get / more pure / of higher quality than the average link from most commercial sites. In that sense, the raw number of .edu and .gov links can be seen as a proxy for an indication of if a site has any quality natural editorial inbound links and an estimate of the depth of quality citations a site received.
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