I found speed drill videos on youtube that I want to use in class.
The first is simplifying monomials: http://www.youtube.com/watch?v=F9ZoCvqgPj8&feature=related
The second explains the foil method by the same guy used in the Holt videos: http://www.youtube.com/watch?v=BVRKoEqa1bg
Regarding fair use law, teachers have a lot of latitude to use parts of copyrighted materials, but they can not make copies of entire works.
I'm happy to learn about dropbox as I spend a lot of time creating presentations, quizzes and tests at home and email them to my computer at work. I think dropbox could be more efficient on larger files that I send back and forth over several days while I'm creating them.