BitPlayer

BitPlayer is a cool alternative to Quicktime that offers some features that you won't find even in the pro version of Quicktime. The first big ticket feature in BitPlayer is playlists.

Playlists are just what they sound like; lists of movies that you can play in a certain order. BitPlayer has a drawer into which you can drag different movies to create a playlist, you can then play through the entire playlist or just view certain movies.

BitPlayer also supports playing videos in full screen, something the free version of Quicktime should support, and exporting  Quicktime files into other formats.

BitPlayer requires OS X 10.2 and it is a free download.