Hey, this is awesome! One major issue/annoyance with design and typography is organizing, sorting and sifting through an ever-expanding font collection. For the longest time I wanted a font manager that organized fonts by various tags/classifications. FontExplorer X added that somewhat recently, but this takes it a bit further. The ability to sort by ranges of x-height, width, etc can really help with find good good font-pairing options. Obviously, this could become much so much more useful with a larger library of fonts. It would be interesting if there was a central database where everyone could anonymously upload the results of their own library. Such a database could be helpful for people trying to find similar fonts, better pairings or just a better way for font managers to organize fonts.