Another use for USB drives is portable apps. If your office does not allow you to install your preferred browser or apps, you can often use a USB drive to run a standalone apps on the drive. This also very useful when traveling and having to use internet cafes, since you can retain all your personal bookmarks and extensions. Lifehacker had a great article on the subject. Definitely worth a read when you get a chance. Unfortunately, my office now has a no external device or drive policy. For a while, we got away with using online file storage and sync sites such as DropBox and SkyDrive, but now they are also locked down.