I got this info from a teaching website (
http://mrroughton.com/faq.aspx). I haven't tried it yet. If you do, let me know if it works!
"The easiest way to do this is to type the word "Kick" in front of the YouTube address for the video you want. So, if you wanted the incredible video found at
http://www.youtube.com/watch?v=IxKzuhl8EbM you'd simply go up to the address bar in your browser and add the word kick so you'd now have:
http://www.kickyoutube.com/watch?v=IxKzuhl8EbM.
Follow the new link and download the video in any number of formats. I recommend downloading it as either FLV or MP4. FLVs can be converted to MPG using Pazera Free FLV to AVI and MP4s can be converted in many video editing programs (I use Adobe Premiere Elements)."