TubeTV is a freeware program for Mac OS X Tiger, Leopard, and above which enables you to search for, save, and convert YouTube and many other flash videos to a format suitable for playback on your favorite devices.
A built in search bar and web browser helps you conveniently locate your favorite videos from common sites such as YouTube. If you prefer, a single button or menu option will grab the currently displayed URL or movie from your default web browser (Safari, Camino, Firefox, or OmniWeb). High quality video conversions using the H.264 codec are performed with QuickTime and Perian. If desired, TubeTV can add exported movies directly to iTunes and set appropriate comment tags enabling you to create a smart playlist. Alternately, double clicking on a converted video file will open it in iTunes or drag and drop a saved video file on to QuickTime Player to view it locally.
Requires Mac OS X 10.4 or higher.