I've said it over and over again of the importance of 'incoming links' to your site. In the search engine's eyes an incoming link looks like a vote for you. When the incoming link has a high PageRank or PR, the search engines view it as a primo vote!
So what exactly is PageRank?
As defined by Wikipedia: PageRank is a link analysis algorithm used by Google that assigns a numerical weighting to each element of a hyperlinked set of documents, such as the Web, with the purpose of "measuring" its relative importance within the set.
Translation: How Google measures a site's importance, based on criteria such as its incoming links which it gives high marks for.
Further translation: You want PR of 4+, or even better you want to have those very sites link to your site.
When the engines see that you have sites with a nice PR rating link to you, they realize that what you have to say must important, relevant and they need to check you out. When they realize their suspicions are correct, up goes your own rank!
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