2010: Development: Found http://camstudio.org/
and purchased a $15 microphone from DickSmith.
Now I have a much better way of sharing my ideas!
These are so quick and easy to make, if you are interested then go to www.youtube.com and enter "allanpriscilla geometers sketchpad" in the search box. You will then get the complete set.

The video below was my trial: before racing out to get the microphone.