Khan Academy

http://www.khanacademy.org/images/handtreehorizontal.png?645.345756376245839579
This site is a fantastic resource for instructional videos in Science, Business Ed., and particularly Math concepts. This is useful for teachers, parents, and especially students, who can watch the YouTube videos from home at their convenience.
Click http://www.khanacademy.org/ link to open resource.