This page has information about pinhole photography like the pinhole diameter equation for inches AND millimeters.
26 videos : 2-3 minute video overviews of different point and shoot digital camera makes and models. Have a group of teachers with different cameras? Send them here to find theirs (or one similar) to get the basics.
26 videos, 2-3 min long : each demonstrates the basics of the dials and buttons on a different make/model of camera. 2007