This page is a listing of major advertising and marketing portals to the web. These massive sites cover nearly every topic in advertising and marketing. Links on these sites include commercial fee based services.
A very interesting site. Although free, it does require require that you sign up for somethings. They are "an information provider focused on the global advertising industry. We have partnered with leading trade press in over 10 of the largest advertising markets around the world and also have partnerships in place with the industry's top festivals and award shows. In addition, we work with some of the largest industry management consultants. In all we have information on over 20,000 agencies and 70,000 ads (tv, print, interactive, etc.) from around the world."