YouTube can be a great resource for quick videos that support the content you are teaching about, but so many schools have it blocked. You might find the video you want at home, but then it is a hassle getting it onto your computer at school. Here is the fastest, easiest and freest (is that a word?) way I have found.
Zamzar – All you need is the link for the YouTube video you would like and an email address you can access at school. You will be able to access your file in minutes.