Winamp, the AOL-owned mp3 player of yore, will close up shop for good on December 20th, which means you have exactly one month from today to use the service -- if you're still using it, that is. In addition to shutting down Winamp.com, AOL and co. will no longer offer downloads of the media player. It's hardly a surprising announcement, but it's a slightly glum one considering Winamp's popularity in the late nineties and early aughts. Go ahead, you have our permission to get nostalgic for a moment or two.