If you're worried about losing your data to theft or water damage—Hurricane Katrina victims?—Kingston's DataTraveler Secure should be right up your alley. Not only does it have 256-bit Advanced Encryption Standard (AES) hardware encryption, it's protected by a titanium waterproof coating that protects your drive from agua for up to four feet.
The drives are available in up to 4GB sizes ( 147 or $273), and have a read and write speed of 24MB/s and 10MB/s respectively. Definitely useful if you're using your flash drives out in the field like Jack Bauer where you can get wet at a moment's notice.
Kingston Launches Waterproof USB Drive [Bios Magazine]