Just stumbled on to this thread! What an interesting and informative thread! Wonder why there has been no replies so far. The Camera Sim (for Simulator) is a great way of learning the basics, especially the relationship between shutter, ISO and Aperture. Also how the same subject looks at different focal lengths. I recommend every newcomer to photography take full advantage of this site!
And a big THANK YOu to Henry for pointing to this page!