In addition, the sidebar includes a number of "related pages," which display links to Google organic search results and Google news links salient to the content of the user's e-mail--for example, a commercial e-mail from Amazon.com promoting the new "Chronicles of Narnia" movie might be accompanied links to news stories about the film's box office debut or the controversy surrounding the movie's strong Christian overtones. This information sidebar operates on a similar principle to the AdWords ads that monetize the search giant's e-mail property. When a user receives an e-mail, Gmail appends sponsored links based on search terms culled from the text of the e-mail itself.
--Shankar Gupta