Amit Singhal, a Google Fellow in-charge of Google ranking team have made a new post now in Official Google blog about the technologies behind Google rankings. This is addition to the previous post which was the Introduction to Google rankings. There, he shared the philosophies behind Google ranking in the brief:
1) Best locally relevant results served globally. - they often this the "no query left behind" principle
2) Keep it simple - this simple understandable system has allowed them innovate quickly, and it shows.
3) No manual intervention - answer to Does Google manually edit its results?.
Well, the above points are the philosophies of Google rankings. But now, it's all about the technologies behind the rankings for any website in Google results .
URL to read about behind Google rankings - http://googleblog.blogspot.com/2008/07/technologies-behind-google-ranking.html