“Certified” is basically the same as with “Certified for Windows XP”. A product that wants this logo needs to meet a number of criteria, some of which we don’t, and in fact, don’t really bother meeting, too.
For example, every “Certified for Vista” application must be installed/updated using Windows Installer - something we don’t really plan to do as we have invested lots of time and effort to make our updater quite robust and reliable…