xVideoServiceThief is currently in the Alpha stage and already supports the following websites: *123video, 5min, aBum, Aniboom, Bebo, Blip, Boingboing TV, Break, Broadcaster, Caught On Video, Ceknito, CinemaVIP, Clip4e, ClipFish, Dailymotion, Dumpalink, GameSpot, GameTrailers, Glumbert, Google Video, GodTube, LiveVideo, Lulu TV, Metacafe, MySpaceTv, MySpass, MyVideo, Sclipo, Spike, Stage6, Tu.tv, Tudou, Video.ca, VideoLeak, Yahoo Video, Yikers, YourFileHost, YouTube, YouTubeIslam, Zaable, ZanyVideos, ZappInternet, Zedge, ZippyVideos, and Zuuble.*
Since this is a Linux blog, and thats where our allegiance lie, here is how you would install it (other OSes would be as straight forward me thinks):