Thanko, Japanese company has come up with a solution to protecting secret or sensitive data stored on your USB flash drive without the use of encryption called the USB Lock. USB Lock is a padlock for USB flash drives. The padlock cap can also be used with mouse, keyboard or other USB devices. More pictures
The USB Lock requires a number combination to release the drive. They have reduced the price from 780 Yen to 480 Yen at Thanko’s website.