DownThisVideo! - Download videos from YouTube, GoogleVideo, Metacafe, DailyMotion, Vimeo, etc...

Copy the link of the video page and paste it here:

Example: http://www.youtube.com/watch?v=a7FQPMiph9M

NEW!. You can download videos from Vimeo!. :-)

Utils:

Drag this link DownThisVideo! to your Bookmarks Toolbar and you can download videos from YouTube or GoogleVideo pages.
WPvideo. If you have a blog with Wordpress, you can install this plugin that allows you to insert videos into your posts and pages in an easy way, and create a link to download videos, using DownThisVideo!, from your own posts!.