You just need leawo youtube downloader. Not only can it download video from youtube but also it can download video from other sites like myspace,Google video, iFilm, Dailymotion, etc very fast because it can speed up video. http://www.google.com/search?hl=en&q=leawo+youtube+downloader&aq=f&oq=&aqi= after you finish download it you still should convert it to other popular formats such as wmv,mp3,mp4, avi,3gp,3gp2 etc. For Windows: http://search.yahoo.com/search;_ylt=A0oGkxPCdUlK9mUB08RXNyoA?p=leawo+flv+converter&y=Search&fr=ytff1-tyc&fr2=sb-top&sao=0For MAC: http://search.yahoo.com/search;_ylt=A0oGklcpNoVK9QQBhhxXNyoA?p=leawo+mac+flv+converter&y=Search&fr=yfp-t-151&fr2=sb-top&sao=1