Answers: if you use firefox you can download the "unplug" extension and you can walk to youtube scrutinize a video afterwards click on the little fish and can download the movie.
Try TubeHunter Ultra which downloads Music/Audios and video from over 520 youtube characteristics web to any format you want.
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TubeHunter Ultra downloads YouTube/Myspace/Metacafe/Dailymotion video to PC/iPOD/PSP/ZUNE/MOBILE
Homepage of TubeHunter - "www.neoretix dot com"