Is there a program that will provide a visualizer for any arbitray audio output? Basically, I want to play Pandora at a party and supply some funky visualizations to go with it. Pandora either uses Adobe Air or its own Flash application, so I can't stream it through Winamp or something similar. I'd really prefer not to jerry rig it using an extra audio cable either.
For what it's worth, I'm on Windows 7. I heard Vista+ did funky things with the audio stack, so I figured I might as well get that out there.