The Songbird Media Player is a desktop media player, built atop XULRunner platform (also used by Mozilla Foundation’s Firefox and Thunderbird), and will run on Windows, Mac OS X and Linux. Just like Firefox, it will be open to extensions!
Could be the best thing in DRM (Digital Restrictions Management) free media players since Winamp 2! It could also be the first widely known application from outside the Mozilla Foundation to build on XUL (XML User Interface Language).
Darren Barefoot thinks Winamp + FireFox = Songbird, and is looking to give it a spin, too.
Update: VLC Media Player 0.8.4 is out : many improvements including a new VLC cone, new Mac OS X wizard and extend controls dialogs, tree playlist skins2 support, HTTP interface CGI handling, linux binary codecs loader, UPnP and Bonjour service discovery, shoutcast stream forwarding, new languages …