Compatible with Mac OSX and most versions of Windows (probably works with Linux, too, but we haven't tried it yet), Magnetosphere takes about a minute to install and run. The graphics are superior to any of the myriad other visualizers available right now and you can even adjust the sensitivity of the on-screen splashes and sparks by hitting the + and – keys, or add and subtract the number of particles in each image with the A and S keys. Be careful, though: If you go crazy with the key punching, your computer will get a little angry and, Fred Sanford-style, call you a dummy by freezing the app. That's why this is the beta version. While Barbarian works the kinks out, just restart iTunes and all is well.