I found something, although I still have to investigate a bit how it works and whether it serves its purposes well:

http://www.blendernation.com/tool-to-display-blender-keystrokes-in-video-tutorials/

http://www.romeosa.com/osdHotkey/help.html

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt