Easy way to Download youtube videos to your computer

Using 
1)www.KeepVid.com.
2)http://www.zillatube.com/
3)www.savevid.com

                     You’ve all probably wondered how you can download the videos you find on YouTube to your hard drive so that you can use them for other projects, such as PowerPoint presentations or video montages. Or, perhaps you’d like to take them with you to places where you might not have access to the Internet. While there are many ways to do that, most focus on extensions or add ons for the Firefox Web browser. And that may leave you wondering if you can do the same with Internet Explorer. Well, the answer is yes and it’s very simple to do. First, just direct your browser to 
KeepVid is a Web based YouTube downloader that’s very easy to use! It can be used anywhere and accessed from any regular Web browser. The homepage looks like this: