So, you just got a USB key from the conference you just attended. Before you toss it into that "box of stuff" take a moment and conscider using it in a more effective manner.
The guys from "Hack from a Cave" have put together a great platform and script that enables you to combine different Live Distro's onto a single USB device. Alternatively you can build your own set of Distro's with Forge and install them onto that piece of Swag. All the tools and downloads can be found here.
Either way, its time to pull out that USB and get your Linux on.