Reader Sebastiaan sends word that Fuzzmeasure Pro 3 is out (and that he designed the icon for it-- very nice). Released on the three-year anniversary of the first version's release, the update has a host of new features, including integration with Leopard's Core Audio, the sweet audio graphs that the app is known for, and even Quicklook and Safari plugins. It's been used to set up concert systems for "...Linkin Park and other big name bands around the world." Cool!
As you may have guessed from reading "Core Audio" and "Quicklook", Fuzzmeasure Pro 3 is Leopard-only (and loving it). You can download it (and eventually buy it for $150US) over on SuperMegaUltraGroovy's website.