Oh, you mean a simple media player. I use XBMC more often than anything, but that's because I use my Harmony remote to navigate and select songs (and movies, Internet streams, etc). When I've got the keyboard dragged out, I often use Daum PotPlayer. I'm not fond of PotPlayer's defaults, but it's not too hard to poke around and get things changed the way you like.
Are you looking for a Mac or a PC?