I've posted version 1.0d5 of QuickTime Amateur, a free-as-in-speech (GPL) clone of Apple's QuickTime Player. Currently this has only been tested, designed, and run on the Mac, though a Windows port is on the TODO list. Version d5 implements several new features including audio controls. Amateur is still rather rough. However, this development release is a reasonably functional movie player application including such useful features as full screen mode and the ability to keep a movie on top as you switch into other applications. I am now eating my own dog food. I.e. I've made Amateur my default movie player.
Keep-on-top feature is a real killer feature that QuickTime Pro does not have. I find it very useful. I borrowed the idea from MyTV and VLC. However unlike VLC, Amateur follows standard user interface guidelines.
Through the magic of QuickTime, Amateur can also display most image formats (PNG, GIF, JPEG, PDF, etc.) and play most audio formats including MP3. However the user interface is more geared toward movies than those other media. Editing support is still partial, and recording is not yet supported at all. As time permits this will be added. Enjoy!