One of the most useful items to complement a security concious persons personal computer toolkit!
The homesite for the product is https://www.ironkey.com/
It may seem overly expensive but take a look at the added extras and look at the iron key forum. They do 1, 2 , 4 and 8 Gb versions and the secure sessions and password manager are superb. The price does fluctuate due to the $ as they are made in the states.
I got shot down for a decent deal on Norton 360, I believe these are an excellent buy for the security concious.
THE WORLD'S MOST SECURE FLASH DRIVE The IronKey is a high-speed hardware-encrypted flash drive that stores and protects your files and passwords with military-grade AES encryption. Safeguard your data, securely store and backup your passwords, and surf the Web safely and privately without leaving a trace on your computer. Features Hardware encrypted USB flash drive - The world's most secure flash drive providing strong authentication and safe data storage. Extremely fast and secure with no need for additional hardware or software. Online services - password data is encrypted and backed-up on to the IronKey.com online service. Strong authentication allows users to recover their passwords in case they lose their IronKey drive. Privacy protection - IronKey drives carry a high performance portable FireFox web browser which allows you to carry your bookmarks and cookies with you. The IronKey.com Secure Sessions service facility adds anti-phishing, anti-pharming and anti-profiling for web surfing. 1 year of Internet protection services Secure updates of IronKey software and firmware Online Security Vault for encrypted password backup Firefox for Secure Sessions and safe browsing