|Screen Capture AVS|
(You will need to have Google Chrome for best or Firefox 3+ for good results, Safari & Opera support is choppy the author says. Also this will not work in Internet Explorer!)
Here's the direct link:
If that doesn't work, try going to the author's article first:
and click the "Clicky" link there.
PS: For all you Radiohead fans, try this: http://www2.nihilogic.dk/labs/canvas_music_visualization/ also by the same guy.
Jacob Seidelin's page
thx ~unconed for the link