There sure is, open up this web page -
http://javimoya.com/blog/youtube_en.php
Then copy and paste the address of the website page where the video is located into the address bar under the word "Video Downloader 2.0" on the web page.
Click on the download button to the right of the address bar, and you should be presented with a link underneath, if it is a .wmv file i think you can just right click and save-as, if it is a flash video, you will need to change the extension to .flv then right click and save-as, then save to desktop or wherever.
I think you will need to have installed the latest flash players from adobe also, you will need to download the flv player aswell, it is all self explanatory and all the help you need is on that web page
FAQ page -
http://javimoya.com/blog/youtube_en.php#tabsini
Tutorial on how to use website -
http://videodownloader.net/help/vd01.htm