Start your Winamp2.x. Select "Wascreensaver" from standard screen saver list and enjoy. Read text after installation for short handling info. Should work with W2k an XP, others not tested.
Allows for you to view and control Winamp while screensaver is on. Not very snazzy looking, but, definitely gets the info across. Fairly easy to setup and use; comes with a nice readme file.