For those with Palm devices you may wish to take a look at Handsafe which looks a most useful Palm OS program. "With this program you can lock your palm avoiding curious view that the contents of your files or even access to its programs. Also blocks access to the memory card. In this new version it encrypts the passwords for access and encryption. The encryption algorithm was optimized. With 128-bit encryption algorithm and blowfish. "
More deets after the jump.