TopTech offers the Slim Data USB flash card, which is probably the slimmest flash drive on the market. At the size of a credit card, you can put the Slim Data in your walle or pocket. The device has 4GB capacity and uses USB 2.0 interface. This ultra slim flash drive weighs just 9 grams.
Available in Smoke, Red and Blue, the Slim Data is priced at $24.99.