OnePC has gotten hold of one of those EasyDrive Removable USB Disk Drive units. they're very small, but can hold a good amount of data for you. Go see if it's any good! here's a snip:
"Do you need to be able to transport files between multiple computers? With storage sizes of between 16MB to 256MB and utilizing a USB port that most modern computers have already, EasyDisk allows users to transport files between virtually any computer."