Portable storage issues..

When flash memory "thumb" drives first hit the market, I really didn't have a use for them. Network accessible mass storage and the limited capacity of the portable devices made them less than relevant. Once they reached 2G in size, quadrupling my network storage, they became a lot more practical. These days I carry a 2G flash drive to shuttle data back and forth from home and work, and I have an 8G at home that I use for quick maintenance file transfers on my home machines. As the capacity increases, I'm finding that I'm relying on these devices more and more which is particularly scary to me since they are so easy to lose track of. Small size, plus the tendency to forget that they are hanging out of a lab computer could be a recipe for disaster. I've already started a regimen of backing up my main flash drive weekly, but this still doesn't account for someone finding your lost drive and absconding with personal data. I've lately taken to making the volume label on flash drives my phone number, so at least if lost and then later found, it will be relatively easy for the finder to contact me. I also toyed with the idea of attaching the drive to a retractable keychain, but that seems a bit much.

Anyone have other ideas for keeping track of flash drives?