In his blog, a student from the University of Amsterdam reports that he gathered around 15 million Gmail addresses from Google user profiles within a month. Matthijs Koot analysed just under 35 million profile links from Google's profile site map, which is easily accessible on the company's servers.
Koot says he used the same IP address for all of the 35 million queries, but Google didn't attempt to stop the mass download. A Google spokesperson told British IT news source The Register that the site map does not make any information available that is not already publicly accessible.

The site map contains URLs to more than 7,100 text files with 5,000 profile links each. Site maps help other Web services map a web site's structure

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