the tutorials are really nice.. gentle, encouraging, and clear. great stuff. i think i can see your future as a teacher.

i can only think of a couple of generic issues:
1) the fonts and font sizes can be a bit tricky to read on a big screen.. this isn't a big deal if the program you are using to make the sldies has other advantages and ways of displaying info, but it's something for you to consider if you are open to other tools.
2) tutorial length -- consider me one of those who thinks its better to err on the side of having short tutorials vs long ones. tutorial 3 was fine length but i wouldn't hesitate making them even shorter, and certainly no longer.
again, really great stuff -- you are an excellent teacher.