This is great for conferences and events; instead of using just lanyards, why not use a lanyard that has a USB flash drive integrated into it?
Everyone uses lanyards at conferences and other events, but you want to make your brand stand out. Why not add a USB to the lanyard?
This will provide greater utility to the attendee, making him keep the lanyard and USB drive for longer. Since both items have your branding on them, this means increased exposure for your brand.