Vertical ad network Travel Ad Network has become the exclusive sales representative for the new Web site www.travel.dk.com, featuring content from The DK Eyewitness Top 10 Travel Guide series of over 70 titles. DK (U.K.-based Dorling Kindersley) is a travel guide book publisher in the U.K. and in the U.S. In addition to DK Eyewitness visual content, the Web site features a Travel Community section. Users may contribute reviews, ratings, select destinations and even create their own tailor-made travel guides. DK will support the launch with U.S. and U.K. online advertising campaigns, a viral competition and the chance to win a holiday worth almost $20,000.