Mirrorboard

Or, how to type with just one hand (I am typing this post with just one hand).

Mirrorboard was an idea that Randall Munroe outlined on his blog.  Go read it.

After looking around on the web for a suitable way to have this on Windows, I stumbled across this topic on the AutoHotkey forums.

(AutoHotkey is a scripting system that allows for making keyboard shortcuts to do various things)

Basically, it was an implementation of the mirrorboard system on windows.

You can get it here (no installation of anything necessary–just run the code).

To temporarily turn it off (if you type very quickly and sometimes have a slight temporal overlap between the space bar and the other letters), press Ctrl+Space.