There are tons of websites that let you save YouTube videos, but KissYouTube might make it even easier.
When you see a video you’d like to save, all you have to do is insert kiss in front of the YouTube URL, i.e.
You could also enter the YouTube URL in the form on the KissYouTube homepage and get a link to download the .flv file.
You’ll need a .flv capable player to view the file on your computer. KissYouTube lists a few .flv players and if you don’t want the .flv format there are some converters listed as well.