This is not Business related, but I enjoyed using it much.
http://7awel.com/ helps you convert and download you-tube videos.
7awel.com can convert a youtube link into many Video or Audio formats. It is free and without any registration.
You know also… youtube is not only about entertainment, there is also ocw.mit.edu and www.khanacademy.org where you can view many educational materials using YouTube and learn about school, university and post graduate lectures. 7awel.com can help you take this material offline and view it on the go.
Hope it is useful.