In the United States alone, there's at least $70 million in fake currency floating around. Fortunately as the technology counterfeiters use improves, so does that of the bills. Color-changing ink, special polymers and holographs are just some of the innovative technologies incorporated into today's banknotes. In 2007, the International Association of Currency Affairs picked the best new counterfeiting technologies and tactics.

Launch the gallery for a look at the inaugural winner and a few other innovative currencies.