Dana, if you're looking to create a 'primer' for spey casts, may I suggest looking at the 'online tuition' section of Eoin Fairgrieve's site - although as a member of the Loop team I'm sure you know it already.
Your existing video clips are excellent, but to my eye they are targetted at the experienced caster who wants to polish his technique, or those who are interested in comparing different styles among experienced casters.
I very much like the way Eoin has set his site out, with a page describing the motions that go into each cast, coupled with a video clip. A complete beginner can follow the learning process step by step, starting with the formation of the D-loop and progressing through simple roll and switch casts to the single spey and then the more complicated casts. Tuition on the water is obviously the best way to learn, probably followed by video with the benefit of commentary, but I reckon Eoin's site has the best basic instruction I've found on the net - at the moment :devil: