Here is a piece of information about Google’s trustrank. It gives some insight for link building strategy

“TrustRank” is a term recently trademarked by Google. In talking about TrustRank, Google says, “Web spam pages use various techniques to achieve higher-than-deserved rankings in a search engine’s results. While human experts can identify spam, it is too expensive to manually evaluate a large number of pages. Instead, we propose techniques to semi-automatically separate reputable, good pages from spam. We first select a small set of seed pages to be evaluated by an expert. Once we manually identify the reputable seed pages, we use the link structure of the web to discover other pages that are likely to be good. In this paper we discuss possible ways to implement the seed selection and the discovery of good pages. We present results of experiments run on the World Wide Web indexed by AltaVista and evaluate the performance of our techniques. Our results show that we can effectively filter out spam from a significant fraction of the web, based on a good seed set of less than 200 sites.”

In essence, TrustRank is a way to cut down on spam and filter out content that is not relevant to the searcher in order to bring them results they really want

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