Trustrank was born out of a need to test web sites for quality links and to combat spam linking efforts. The theory on trust rank splitting is a simple concept of dilution. If a webpage has 10 links on a page that are good links then the TrustRank is better in the sense that the few outbound links are probably going to be good links. Inversely if a good site with TrustRank credit has hundreds of out bound links then the probality that there are a few bad links goes up.
Therefore, it is best to keep the number of links on your page to a minimium. The score TrustRank score is computed then divided by the number of outbound links. Hence your good seed page's score, with a TrustRank, will be divided by the number of out bound links. So in the Trust Rank Splitting example page three would receive a score of: ß· (1/2 + 1/3).
How do you get a TrustRanked Site?
Get more links from reputable sources. The more personally, thematically targeted links the better your odds are of having higher TrustRank. Identifying a good link is another topic that could be discussed. Fill out the SEO - SEM information request to find out more about Trust Rank and getting quality links.