Disk Wizard is a disk cataloguing program. But unlike other such utilities, it does not require you to scan disks after changing their contents; instead, they're scanned automatically when you eject them. This means that Disk Wizard always knows which file is where, without bothering you in any way.
Disk Wizard's main limitations are the following:
Disk Wizard is now free. If you're looking for a replacement for Disk Wizard, you may want to check out CDFinder, because it is able to import your existing catalog files.
Disk Wizard 2.0 is available in...
Warmest thanks to Marco Muratori for the Italian translation, and to Ted Svensson for the Swedish version.