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All popular video sites hold for each clip more than one video files with different qualities (Youtube is the champion here - up to 35 qualities per clip). 3D Youtube Downloader fetches complete list of available qualities with detailed info and depending of current work mode automatically selects appropriate file to download or gives you an opportunity to do this by yourself.

Different people have different needs. To meet all of them without complicating user interface, while maintaining wide functionality, program provides three work modes:

Simple Mode. Downloading in original quality; download target selects automatically by the program
Advanced Mode. Downloading in original quality; download target selects manually by the user
Convert Mode. Transcoding to selected format; download target selects automatically by the program

Other program advantages:
20 supported sites including Vimeo, Liveleak, Dailymotion and others
downloading subtitles from Youtube and Dailymotion
support for Youtube Adaptive Streams
support for 3D videos on Youtube and Dailymotion
support for Youtube and Dailymotion feeds (playlists, channels etc)
search on Youtube within the program
it is fast (using multipart downloading for files and HTTP compression for pages)
multi language support
quite nice Aero UI

Size (7z): 26 Mb