I have been able to find excellent YouTube videos to on Physics to share with my students as well as videos that I have been able to use to deepen my content knowledge. I am so glad the district opened up access to YouTube. I have used a YouTube video the first week of school to motivate my students. Check it out below.
Here is another YouTube video I plan to use in my physics class to demonstrate to my students how you can use physics to make a positive impact in the world.
I already have a DropBox account. I use it to collaborate with other AP Physics teachers to exchange lessons, exams, labs and worksheets.
I am glad to know that there are copy right exceptions to teachers under the fair use in the US Copy Right Law that makes our job easier.