Here`s a way to do it for free:
Download YouTube Videos for FREE!

On youtube.com, open the video you want to save.
With the video running,go to your browsers address bar and insert the word "kiss" right after "www" and before "YouTube". Then hit Enter.
That will take you to the KissYouTube Web site,
where you can download the video with a single mouse click.The only caveat is that you must download it as a .flv (flash video) file, the format used by Youtube,Google Video and others.

Depending on the versions of Windows and mediaplayers you have,you may be able to view the video with RealPlayer or Windows Media Player.But if you can`t, don`t sweat. Goto
www.get.adobe.com/amp, where you can download the free,flash-capable Adobe Media Player.

You also might want to convert YouTube videos to other formats so they can be placed on a DVD or loaded onto a iPod.In that case,you`ll need a program such as Video Piggy($24.95 from www.videopiggy.com)which lets you download directly from YouTube and convert into most major formats.You can even extract the soundtrack from a video and put it on you MP3 player or phone.

Have Fun! dave