Came across this article - http*//news.com.com/2100-1032-5153627.html
Have seen them in the logs several times over the past few months. Interesting read
"IBM found that it could excavate more interesting data from pages that the theory of hubs and authorities normally pushed to the bottom of the heap--unstructured pages like discussion boards, Web logs, newsgroups and other pages. With that insight, WebFountain was born."