http://www.sitepronews.com/pagerank.html Relevancy does play an issue obviously, but here's the latest on what to shoot for. So remember, just a few good relevant backlinks can push you to the next level
initially it was calculated based on the number of back-links -------------- but now the QUALITY of sites that refer to ur url also matter a lot --- a lottttttttttttttt ....................... so try to get quality back-links .