Found another site to download youtube video. The page is simple and very esay to use. Check out this web page http://hold-tube.com/, they provide facility to download video from well known video sites such as youtube , google video, yahoo video, metacafe, dailymotion ,myspace video and many more. The number of supported video sites will grow and counting up.
HoldTube supports to download flv, 3gp, mp4, flv-HQ and mp4-HQ format for youtube video.
One interesting features that this web site provide, is we can enter up to 10 link video silmutanly.