AdForum.comAdForum says that it is "the Internet’s leading portal to the advertising, marketing and communications industry, with direct links to 18,000 agencies in 136 countries." "Ad-Folio" search finds details (like agency) on a particular brand ad campaign, but a reproduction of the ad is not free. The Ad Firm Search allows the location of firms, by specialty, geography, and size. Not a lot of details are provided, but there is a link to the company's website, where available.