1. A computer-implemented method, comprising: at a search engine, first, receiving a user's ratings of some, but not all, web pages associated with a group of web pages, the group of web pages selected from the group consisting of web pages in a particular web site and web pages in a particular subunit of a web site; second, generating a user-specific site rating for the group of web pages based on the user's ratings for said some, but not all, web pages in the group of web pages; and third, generating a user-specific rating of a web page that is associated with the group of web pages and that did not receive a user rating, including rating the web page using the generated user-specific site rating for the group of web pages.