No link (as of 04/09/10)
It does not allow to download the video directly from Youtube. It just redirect to another website from where we could download the video in different formats as mp4. 3gp or flv. I felt that annoying.
This script just adds a link to youtubeloader; it doesn't do anything you couldn't do with a bookmarklet, except for only displaying the link when you're on a Youtube page. (I haven't installed it; I just read the source.)
Doesn't even do half of what it describes. Get bent.
PS: THIS SHIT SUCKS.
Thanks for the work, I can download MP4 video with the script, but the video download is not the really MP4 format which can not tranfer to other devices like iPod.
I would recommend you use these tools:
YouTube Downloader and Converter
Download YouTube Videos
YouTube Downloader for Mac
These tool not only help you download YouTube but can help you convert YouTube videos to MP4, and Convert YouTube videos to MP3. Also you can insert YouTube videos into PowerPoint and make a great presentation.
Enjoy YouTube videos, Enjoy life!