Domain age, page rank, back links? These have always been VERY strong factors in Google weighting of documents.
Like said above reciprocal links, linking networks, inter-linking has been de-valued a lot in the last few months for Google.
Quote:
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"A fairly common belief has been that PageRank would be or is being replaced by TrustRank and Google would not give us a green bar to gague a site's trust on (good call Google). With this in mind one of two things has happened; either Google has decided the TrustRank is irrelevant and so is PageRank and decided to scrap both (unlikely) or they have shifted the weight from PageRank to TrustRank to some degree and are just now sorting out the issues with their TrustRank calculations (more likely). Issues that may have existed with TrustRank may not have been clear due to it's weight in the overall algorithm and with this shift reducing the importance of PageRank the issues that face the TrustRank calculations may well be becoming more evident"
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Huh? I would like to see a LOT more evidence of this.
PR and TR are used in tandem. One doesn't replace the other.
The problem with Google current ranking system is simply. They simple put to much weight on the anchor text of a link making them highly susceptible to spammers.