I came across a user-friendly online tool KeepVid which will make downloading video easy from all popular websites like YouTube, MegaVideo, Flickr, Dailymotion, Facebook, Google Video, Vimeo, Metacafe, Photobucket, eHow, TED, TwitVid, Ning, Current, Clipfish.de, blip.tv, Break and more.
KeepVid.com is a web-based video downloader.
Perfect for those who are on the go or do not wish to install additional applications on their computer, KeepVid oozes simplicity and idiot-proof video downloading.
To download YouTube videos, simply copy the URL of the YouTube video page you wish to download, and paste it in the Keepvid Textbox and click on Download .
A link will then appear which allows you to save the .flv video file to your computer! As an added bonus, KeepVid can also download videos from several other video streaming services such as Metacafe.
It also comes with a bookmarklet so you can download any video you’re watching with one click.