Lots and lots of models on the Solar System, Eclipses, and Tides.

Solar System
http://www.pbs.org/wgbh/nova/space/tour-solar-system.html

Eclipses
http://www.forgefx.com/casestudies/prenticehall/ph/eclipse/eclipses.htm

Tides
http://www.youtube.com/watch?v=-mBvBdGTkR8&feature=related

Sorry its not in the traditional bookmark. I didn't want to have 18 different links for Earth Science specific models.

What an awesome idea. It completely rethinks everything about how the traditional classroom is supposed to work. Just the chance to give more lab time in the classroom is worth trying this let alone it could possibly solve the whole homework dilemma with students simply not doing it. The only drawback is that it would be very easy to get into a rut of students not watching the videos, which will lead to nothing being taught at all. But its definitely an interesting idea that I would try with a class that has the self motivation to become life long learners like the video lectures enable.