Google Network is a large group of websites and other products, such as email programs and blogs, who have partnered with Google to display AdWords ads. Advertisers have the option of running their ads on Google as well as the Google Network for no extra cost. AdWords ads are placed based either on searches or content, so the Google Network has two components: the search network and the content network. More http://adwords.google.com/support/bin/answer.py?answer=90958&topic=29 Cheers Lucio