Youtube downloader (video and audio) (also, dailymotion vimeo…)

Something i came upon, to download a youtube video (seems to also works with dailymotion, facebook videos, vimeo… complete list on the website), no need to install a browser plugin, simply add « ss » after the www. 
Exemple: To download http://www.youtube.com/watch?v=jofNR_WkoCE  -> http://www.ssyoutube.com/watch?v=jofNR_WkoCE

You’ll just have to chose the format you want to download to and right click -> download.