Since SD/MMC cards have been around since the paleolithic age, they have been considered a cheap solution for portable storage for cellphones and digicams (yeah, there's also Compact Flash, but its too bulky to be versatile). Kingston has a USB drive that actually serves as a SD/MMC card reader. Just pop open the hood of the DataTraveler and stick your memory card inside to simulate some 4GB Thumbdriving! [source]