From PC Magazine read the whole thing here USB Key Superguide
USB Key Superguide
We’ve put together the ultimate guide to flash drives, U3 keys, and USB hard drives, all of which will let you carry your most important data in your pocket.
There was a time when USB keys—aka thumb drives, flash tokens, or keychain drives—were simple storage devices that helped you carry a file or two. The size was cool, but they weren’t really much better than a high-tech floppy disk. My, how things change. In this roundup, we cover all of the major types of USB keys that are now available: conventional flash drives, U3 flash drives, and small hard drives, all of which use USB 2.0 for fast data transfers.