Youtube Downloader HD saves videos to your computer for playing outside a browser or offline viewing. The videos can be downloaded in Flash video format (FLV) or, where available, MP4 formats (playable by iPhone, iPod etc.). The program can also convert files to Xvid format, compatible with most video players.
Functionality is limited to YouTube. Although there is no batch download, multiple instances can be opened concurrently in order to simultaneously download multiple videos.