A few years ago I found and installed a small Windows utility that enabled me to navigate by using keystrokes instead of the mouse. It ran in the background, and with a keyboard shortcut it brought up a command prompt with a translucent background in which you could type a URL, a disk location or other resource types. After pressing Enter, it would open that resource in the relevant application.
Some time later, the team that developed this utility joined Mozilla to work on some ergonomic stuff there and they stopped developing the application ;) I can't remember if it was open-sourced or not.
I can't find the name of the utility anywhere. I have tried lots of googling but nothing came up. I believe the app was originally written in Python for what it's worth.