Once I had a USB flash drive attched to my keychain, but the USB flash drive is really a burden hanged on my belt. Do you have the same problem? Check out the Memory Key USB Flash Drive. perhaps that’s more suitable to attach to keychain.
The blue key USB flash drive features 2GB memory capacity and USB 2.0 compliance. There is no more special except the key shape. If you need a key as your USB flash drive, you could purchase it for $35 USD from Fitzsu.