Download YouTube videos: How to use as Mp4, 3GP, MP3(sound only) video files

I needed homework about a science topic to be done. I searched some videos as reference and had to download them. Accidentally,  I found a good web tool to help me download YouTube videos. That is Wantyoutube.com (or Wantyoutube and MORE).

WantYouTube is a free and easy webpage for downloading videos from YouTube. It is heard to be a popular video downloadable service in Japan, European and Arabic nations. I think I can use it quite nice for it also provides English language. (It includes: Japanese, Chinese, and English languages!)

WantYouTube provides users to extract, save and download videos and movies hosted on YouTube. The WantYouTube.com is simply easy to use, by just adding the word 'want' into the URL of the YouTube video page as Mp4, 3GP, MP3 files. 

Here we go: http://www.wantyoutube.com/

Have a good time with Wantyoutube and MORE!