PageRank sculpting
http://www.mattcutts.com/blog/pagerank-sculpting/

People think about PageRank in lots of different ways. People have compared PageRank to a “random surfer” model in which PageRank is the probability that a random surfer clicking on links lands on a page. Other people think of the web as an link matrix in which the value at position (i,j) indicates the presence of links from page i to page j. In that case, PageRank corresponds to the principal eigenvector of that normalized link matrix.

I have seen Matt Cutts of Google speak dozens of times, I have seen dozens of videos of SEO tips from Matt, I have read hundreds of blog posts from Matt - but

I have seen Matt Cutts of Google speak dozens of times, I have seen dozens of videos of SEO tips from Matt, I have read hundreds of blog posts from Matt - but nothing compares to his presentation given at WordCamp. Lucky, the presentation was recorded and is available for everyone to watch.