Screenkey - Screenkey is a screencast tool to display your keys inspired by ...
KeyCastr - KeyCastr lets you easily display your keystrokes while recording screencasts.
PxKeystrokesForScreencasts - Displays Keystrokes in an overlay window
Carnac - A utility to give some insight into how you use your keyboard/
KeyCastOW - keystroke visualizer for Windows, lets you easily display your keystrokes while recording...
Key-mon - Utility to show live keyboard and mouse status for teaching and screencasts.