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8. Are there ads in Gmail?
There are no pop-ups or banner ads in Gmail. Gmail does include relevant text ads that are similar to the ads appearing on the right side of Google search results pages. The matching of ads to content is a completely automated process performed by computers using the same technology that powers the Google AdSense program. This technology already places targeted ads on thousands of sites across the web by quickly analyzing the content of pages and determining which ads are most relevant to them. No humans read your email to target the ads, and no email content or other personally identifiable information is ever provided to advertisers.
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http://gmail.google.com/gmail/help/about.html#ads