Google has always kept the number of advertising partners a secret. Google would always say the company had hundreds of thousands of partners, but never anything more than that. Now, from an SEC filing, Google said it had 1 million advertisers in 2007, and now likely has upwards of 1.5 million. Google had 90,000 advertising partners in 2003, more than 350,000 in 2005, and 600,000 in 2006. Google did not add anything else.