Youtube

Go to http://www.liewcf.com/blog/archives/2006/05/video-downloader-download-videos-from-youtube-myspace-and-other-video-sites/ Scroll a bit down and there is a guide on how to download clips from any site, not just YouTube. If you're using Mozilla Firefox as a browser, there's also a VideoDownloader Firefox extension available.

i use mozilla firefox and downloadhelper addons to download video from youtube, veoh, dailymotion, metacafe, its perfectly save, no adware and spyware that could harm your computer and it proves to be the faster beside other website youtube downloader try this tutorial: http://helpmyinternet.blogspot.com/2007/07/how-to-download-video-from-youtube.html

I'm always wondering if it's legal or not, but here's one of the sites allowing this: http://www.downloadyoutubevideos.com/