As much as we like Mimobot drives, and especially their latest Halo family, they wouldn't last a day once our kids got their mitts on them, which they would surely do. But there's a way to revel in your inner (or outer) geekdom with a USB key more discreetly while paying homage to Transformers to boot.
A 2GB Decepticon and a 1GB Autobot are available only in the U.K., according to GeekAlerts, for some unknown reason. Either will easily hold its own in the USB-bot community at large. And they also can be worn on one's person with an accompanying lanyard, for those days when you want something a bit more subtle than Optimus Prime helmet.