If you use a USB pen drive, then it’s worth taking a look at www.stickydrive.com
Stickydrive is a free app which sits on your USB pen, it’s a file, program and document manager that lets you run software applications directly from your flash drive.
Stickydrive can be installed on any type of external memory, you can view your photos, play music, run Firefox (and many other apps) all without having to install anything onto the computer.
