yFlicks is a movie player based on Mac OS X's QuickTime Framework. But it's much more than that: yFlicks comprises a wide range of functionality, which previously required a slew of task-specific applications.
Most importantly, you can watch your movies just like you used to do with QuickTime Player. But in addition to that, yFlicks offers the ability to play videos in fullscreen mode, organize your videos in groups, search them, rate them, and browse them in preview mode.
Furthermore, you can easily download YouTube/Google/MyVideo videos, view them as flash videos (requires the excellent free Perian codec), and export them to other movie formats â” e.g., for viewing them on your iPod.