Sal Kahn through his Khan Academy has built a tremendous collection of over 1800 open-licensed videos offering instruction in math and science. They cover topics in arithmetic, algebra, geometry, statistics calculus, and more and are licensed under CC BY SA.
There are so many great open resources that teachers can use in creating multimedia projects (reports, PPTs, web pages, wikis, etc.) with their students, but they take a lot of time to find and correlate. As a part of a