These are 2 videos I would use for units of study within my curriculum.
weather and seasons
Copyright and Fair Use-I learned that the copyright limits allow for a lifetime + 70 years=forever. I was unaware of the "fair use" policies which have restrictions on use if there is financial or commercial gain from usage.
The dropbox tool would be great to use while at home, or out traveling. Images, and videos, could easily be dropped in and then used later in the classroom without having to mess with converting from different files.
I would have loved to use this when I went to Europe this past spring. I'm going again, and will put it to use!