Rated 4 out of 5 stars
I really like this extension. It is one of my favorites (downloading streaming content from almost any site, and the cool database of video sites.) However there are some suggestions that I have:
1) Very important: The option to download hi-res flv and mpeg-4 h.264 formats, like this greasemonkey script (http://userscripts.org/scripts/show/13333)
2) Make a separate database of streaming audio/music/audio book sites (like last.fm, Anywhere.fm, Batanga, deezer.com, iLike, imeem, Jamendo, MOG, Musicovery, Pandora, Playlist.com, Slacker, SpiralFrog, Zune Social).