1. A computer-server-based method for ranking Web pages in a Web search engine, the method comprising: receiving, over a network at the computer server, a Web search query from a particular user, the Web search query including at least one keyword, the computer server hosting the Web search engine; identifying one or more Web pages that contain the at least one keyword; determining, for each of the one or more Web pages, a raw page ranking; adjusting the raw page ranking of each of at least one Web page among the one or more Web pages based on direct evidence of how interesting the respective Web page is to users to produce an adjusted page ranking, the direct evidence being derived from clickstream data collected from the users; and presenting, as search results, the at least one Web page to the particular user in accordance with the adjusted page rankings, wherein the direct evidence of how interesting a Web page is to users includes a measure of how often the users traverse to or from the Web page in browsing the Web and a measure of how many users have recently visited the Web page compared with how many users normally visit the Web page, and wherein the measure of how many users have recently visited the Web page compared with how many users normally visit the Web page is given greater weight than the measure of how often the users traverse to or from the Web page in browsing the Web.
1. A computer-server-based method for ranking Web pages in a Web search engine, the method comprising: receiving, over a network at the computer server, a Web search query from a particular user, the Web search query including at least one keyword, the computer server hosting the Web search engine; identifying one or more Web pages that contain the at least one keyword; determining, for each of the one or more Web pages, a raw page ranking; adjusting the raw page ranking of each of at least one Web page among the one or more Web pages based on direct evidence of how interesting the respective Web page is to users to produce an adjusted page ranking, the direct evidence being derived from clickstream data collected from the users; and presenting, as search results, the at least one Web page to the particular user in accordance with the adjusted page rankings, wherein the direct evidence of how interesting a Web page is to users includes a measure of how often the users traverse to or from the Web page in browsing the Web and a measure of how many users have recently visited the Web page compared with how many users normally visit the Web page, and wherein the measure of how many users have recently visited the Web page compared with how many users normally visit the Web page is given greater weight than the measure of how often the users traverse to or from the Web page in browsing the Web. 2. The computer-server-based method of claim 1 , wherein adjusting the raw page ranking of each of at least one Web page among the one or more Web pages based on direct evidence of how interesting the respective Web page is to users to produce an adjusted page ranking includes scaling a number of user traversals to the respective Web page from other Web pages, as indicated by the clickstream data.