You thought you'd seen some small USB drives, but this OCZ Ultra-Slim Mini-Kart USB 2.0 flash drive must be the smallest and thinnest yet, just 2.8mm thick. Available in capacities from 512MB to 2GB, it's scarcely larger than a quarter, as you can plainly see. There's even a cool blue status LED on the end.
The question is, how small is too small? This thing could get lost in your pocket.