Audacious is a free, lightweight advanced audio player based on GTK2 which runs on Linux and many other *nix platforms and is focused on audio quality and supporting a wide range of audio codecs. Ubuntu 9.04 Jaunty Jackalope comes with Audacious 1.5.1 while version 2.1.0 is already available for download so if you really like Audacious, I bet you can't wait to upgrade.

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.