Now you can download easily videos from popular video sharing sites like Youtube, Google, Metacafe, iFilm, Dailymotion, and other 60+ video sites. You can also download embedded objects like movies, mp3 etc…
Go to Javimoya.com copy paste your video in the text field, select the video source and click on the download link.
There’s also an addon for Firefox on the site. You may download the addon here
>> Posted by Ram on his blog Technology Bites
UPDATE : I tried using Javimoya but so far all I get are error messages. I tried using KeepVid and VideoDL and from these two sites I have successfully download the video I wanted. Please note that for VideoDL you should right click the download link and save link as ( Firefox ) to your download folder. Please remember to change the extension to .flv.
Please see my previous post too. Hopefully these methods will be helpful. 
Filed under: Firefox, Miscellaneous
Here is a site you can search, view and download YouTube video to your PC.
http://www.ilikeyoutube.com/
Enjoy!