This is a useful item. sort of. A USB key, if you don't know is basically a small hard drives, of sorts. It is also called thumbdrive sometimes. Whereas you used to have to store stuff on floppy disks(You see kids, these were little square plastic disks that you could store data from from ...oh never mind). They've been around a while now and are slowly catching on. Anyway, they are good to have if you carry data (personal or otherwise) from computer to computer. You should really have one. These particular ones are touted to be "gamer oriented", but I have a feeling there is no difference other than the new smart drive standard that is around now. Well, check out the lin below. There is more where that came from...

Sandisk intros Cruzer Crossfire and U3 Smart USB drives - Engadget