The last.fm screensaver is by lukeweb, designed to parse information provided by Audioscrobbler into a more visually edible form (conveniently whilst you're not at your PC). Unless someone shouts at me, or hits me, or calls me names, I might as well squat here for updates on releases and development, for the few of you who might be interested in this...
Current Version
BETA 0.1 http://www.last.fm/forum/21716/_/49573 - For download link and important notes