Hi there!
I have written a Winamp plugin: The ‘Starflight Analyzer’
It runs with window or fullscreen-mode is fully configurable and needs not too much hardware power: A PIII 500 and TNT-class graphics should be enough for a resolution of 1024x768x32.
The source-code is also available for educational purposes only. If you have any hints for improvement, let me know!
And here it is:
http://www.oe.uni-duisburg.de/Persons/Schneider/Person-ger.html
Marc