If you need to use a file or two on your work computer from your home PC, Remote Desktop in Windows 7 makes it completely possible. You're no matter limited to laptops and flash drives. This video form Microsoft shows you the overall use of Remote Desktop.
Remote Desktop connects two computers over a network or the Internet. Once connected, you'll see the remote computer's desktop as if you were sitting right in front of it, and have access to all its programs and files.
This feature is included with all editions of Windows 7, but you can only connect to computers running the Professional, Ultimate, or Enterprise editions.