As you may know, development of MPlayer OS X is moving along several paths. Two of them have similar names and share the same icon. MPlayer OS X - 2.0b8r5 is the most recent version of the older MacOS X port of the opensource media player. It was released on 2005 May 20. The most recent version of the newer and slimmer port is MPlayer OS X - 1.0pre8rc3. It was released on 2005 July 26. My personal experience indicates that the latter port is more stable on MacOS X 10.4.2.