Have you tried Audacious for Linux? I know it can use Winamp skins and all, and it may work with the plugins, although I honestly don't know. What exactly are you trying to do here, because Linux has a load of multimedia apps that stomp Winamp. I use VLC and Audacious myself and have yet to find a format that I am unable to play. It seems to me as though you're taking an unnecessary road to simply listen to Internet radio or record audio.
