There is a program called pass2go by the makers of RoboForm that stores everything on a usb flash drive. You can then take it to any computer and have it automatically go to the webpage and log you in for anything you save in it.

You can find it here:

http://www.roboform.com/pass2go.html

A device like this is often called a "token." Instead of typing in a password, you plug in a device. Access is controlled by "something you have" instead of "something you know."

Microsoft Windows is designed to use a password, so tokens are not commonly used with Windows. Tokens are commonly used in combination with passwords to authenticate people who are accessing computer networks.