It is actually quite easy to set up a character lcd screen displaying winamp info. There is a way to wire the lcd screen to your paralell port using a few simple resistors the plans come up frequently in these forums -
http://www.mp3car.com/vbulletin/index.php and also there are many available winamp plugins available for controling the screen. The mp3car.com forums should have all of the wiring schematics and sites to download the winamp plugin