The Slim Data USB is a credit card sized, very thin, USB flash drive. The theory being that stuff in your wallet is harder to lose. Fold the card in half to extend the connecter and plug it in. Only comes in 4Gb, but there are a range of colours. US$24.99.
Introducing the Slim Data USB Card. The World’s Slimmest, Most Convenient USB Flash Drive. Easy-to-Use and Tough to Lose, Slim Data is Always With You!