iVisualize

Way back at the dawn of Video Thing, I posted about Quartz Composer, an OS X developer's tool that gives you easy and direct access to all the graphical tricks built into the operating system. People have done some amazing stuff with it, including some pretty impressive VJ apps. (I was able to make a couple of screensavers with it.) My complaint at the time was that there was no way to make an iTunes visualizer plug in with it. I wanted someone to make an oldschool analog-looking visualizer like the Atari Video Music to replace the cheesy ravey 90's looking visualizer built in to iTunes.
Today I saw this:

With Mac OS X Tiger Apple introduced a convenient way to create your own graphical effects: The Quartz Composer. Sadly by default these could only be used as screen saver or run in Quicktime.
With iVisualize it is finally possible to run these in iTunes, have them react to your music, and display a lot of song information.

Link