I am a big fan of sitting in front of my comptuer watching my music, and over time I have collected quite a few visulization plug-ins (now called Components with version 3 of WinAmp). I have two favorites acutally.
Monkey 1.0: This is really amazing. Its a series of tunnels and passageways that flow with the music. I listened to Dark Side of the Moon in reverse order (extra trippy!) while watching this visualization. I was so sucked into it that when the album finished, I had to call my friend Sandy so that she could talk me out of the hole I was in. Weird, and cool.
Acidspunk: This is my wifes favorite, and my second favorite of the many I have seen. A variety of colors, and shapes with what is most likely the best beat renderer I have ever seen. It follows the music so very well.
Of course Milkdrop, Mocha, R2, and many more grace my machine, but when I am really in the mood these do it.
What are your favorites?
NOTE: Please don’t link to the acutaly .exe files.