Well i think it can be quite accurate, for instance i ran V7N through & it got 8/10 which is one of the highest i have seen.
Factors taken into the score:
Quote:
Links pointing to full URL: 503016
Links pointing to domain: 777682
Position at Google for first four words of title tag on target URL: 1
Age of Domain: 2176 days old
Links from domains with .edu or .gov TLDs: 39
Alexa Rank: 6133
Domain name visibility: 29600
Number of links according to Technorati: 2348
Number of search results for URL search at del.icio.us: 148
Listings in DMOZ: 2
Links in Wikipedia: 10
Google Pagerank of full URL and Domain: 6
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