YouTube Mate (Downloader + Player + Converter, all in one) A free YouTube Download and playback software.
The latest version 8.xx is available, it supports YouTube HD Video now.
YouTube Mate easily:
* downloads YouTube videos
* supports unlimited simultaneous downloads (a real time saver!)
* automatically names the downloaded video the same as the YouTube title
* converts YouTube videos to various video formats, including avi, DivX, XviD, rm, rmvb, MOV, MPEG, and WMV (Only full version includes this feature.)