The easiest way to download youtube video is to add the word "want" in video link. Like "http://www.youtube.com/watch?v=..." change the URL to "http://www.wantyoutube.com/watch?v=..." This method is easy, free and "Wantyoutube" can download Mp4, 3Gp, which is available for your ipod, ipad. If you just need MP3 (sound file only), "Wantyoutube" can do(no need to use other converter), too. Other formats like flv is available, too.
WantYouTube is for users to download music(MP3), videos, movies or MTVs from YouTube, open YouTube video page. More than that, you can download nearly 400 other popular video-sharing websites all over the world, such as 5min, fc2, Xvideos, mega, Break, Current, Dailymotion, Facebook, Google Video, ku6, Megavideo, Metacafe, Myspace, Photobucket, Sina, Spike, Tudou, Veoh, Vimeo, Yahoo Videos, Yam, Youku. Just visit the "Wantyoutube" and get your favorite videos!!
Go for Wantyoutube: http://www.wantyoutube.com/
View this video for tutorial: http://www.youtube.com/watch?v=iCtZ8EMVJ60
