Learning is so easy: Best way to extract and download Youtube videos

I wanna download a funny video from my best friend, Amy. But I did not know how. One of my Japanese pen pal told me that she usually used "wantyoutube.com." to download Youtube videos. Since realizing that wantyoutube is free and safe, I downloaded Amy's videos successfully. The only thing to do is add a want in front of "youtube" of the address bar. Maybe this is helpful for all of you!

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このサイトをお試しください: http://www.wantyoutube.com/
使用のURL：：http://software.super-idol.com/jp/youtube-dl.htm
日本語のインターフェース。無料です。
VideoのＵＲＬを上記サイトに貼り付けるとＤＬ可能です。JAVA必須。
よろしくお願いします。成功を祈る。
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Here is a tutorial in English: http://software.super-idol.com/wantyoutube/wantyoutube-en.htm
Good luck!!!!