There's a particular link on this page:
http://web.archive.org/web/199804181...d.edu/~sergey/
which i wish it could work... "PageRank, an Eigenvector based Ranking Approach for Hypertext " by Lawrence Page and Sergey Brin. This is work in progress which we intend to submit to SIGIR '98.
Of course, no wonder why is disabled, but really, there are some links on those pages which explain some of the early algorithms used by Google... so, make your own conclusions