Elmedia Player is a convenient multifunctional media player for Mac OS X, which can play a great variety of formats. All Mac users will find its media library easy-to-use and already familiar to them from iTunes. You can create, manage and delete playlists.
Also try out smart playlists: you can create them by choosing special parameters, and then Elmedia Player will organize files matching your criteria automatically.
There is PRO version available. It gives you even more: download videos (including streaming RTMP channels) and animations you like from the web directly to your hard drive; enjoy videos in full-screen mode; make a screenshot of the favorite moment or convert the whole movie into series of screenshots.