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a bookmarklet that can download almost any video from any video sharing site, excepting video services with encrypted media. The range of supported sites is amongst the largest I've seen, and includes YouTube, Dailymotion, Vimeo, MegaVideo, etc. I actually sought out this one in light of the apparent absence of video downloading extensions for Chrome similar to DownThemAll or Download Helper.
All you need to do is click the bookmarklet while on the page of the video you want to download. Note, however, that you need to be browsing videos on the video sharing sites themselves and not watching them embedded in blogs and the like, in order for the bookmarklet to work. (In almost all cases, clicking on the video itself no matter where it is located will transport you to the video page on the video sharing service).
Source (clipnabber.com)
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javascript%3Avoid%28%28function%28%29%7B%2520var%2520e%3Ddocument.createElement%28%27script%27%29%3B%2520e.setAttribute%28%27type%27%2C%27text/javascript%27%29%3B%2520e.setAttribute%28%27src%27%2C%27http%3A//clipnabber.com/scripts/bookmarklet.js%27%29%3B%2520document.body.appendChild%28e%29%2520%7D%29%28%29%29
youtube video nab rip
Works well, even for sites that I've previously been unable to get video from with other rippers.
