Try Tooble!

http://tooble.tv/index.php

Tooble runs on your computer and lets you search YouTube for keywords
(or you can paste in the address (url) to the video).
All you do is check the box next to the videos you want to download,
and Tooble will download them onto your computer.

Tooble downloads as an MPEG file. It puts the download into your Music folder.
You can change settings if you want.

This might be a nice tool for teachers who can’t get YouTube in their school
because of filtering or bandwidth issues on the network.