Enter Audacious, a fork of the similarly-fated Beep Media Player. It works with Winamp Classic skins, satisfying my inner Microsoft fanboy. It can play back MP3 plus a slew of other formats. It's got a little bit of effects processing, some Last.FM support, and a whole lot of visualization plugins (like Paranormal!). Install this player, young grasshopper, and go terrorize ShoutCast with your listenership.