You never know when your favorite videos will be taken down from youtube. before that happens you should download them and keep them on your hard drive. However youtube does not allow download of videos. Fortunately there are large number of websites that allow you to download youtube videos.

There is a problem with these videos though. They are mostly in flv format. You can download a flv player. However when you transfer the file to some other system you will get into the same problem again.

That is why I like vixy.net. It allows you to convert the video into several formats includig avi,divx,mp3,mpeg4 and 3gp.