Free YouTube Downloader
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Full user review
promises a lot, good alternative for http://www.youtube-mp3.org/nl that won't work anymore unless you share which facebook (that I don't have) or give them your mailing list by giving your password (are they (Philip of change.org) mad?)
Installing gives immediately severe warnings from GDATA
Then you have to unselect soms toolbars (SweetIM), that install nonetheless, after which Chrome is shut down incorrectly and all kinds of Messenger (which I never use, don't even know)) applications open. Very unpleasant and alarming experience.