Specimen Sheet Generator

When I started dabbling with DTP, one of the big issue I always had there have always been few programs capable to print decent specimen sheets. While there's little about roleplaying in this post, I think that serious indie game designers could really benefit from a proper specimen sheet.
So, in all of its glory, here's the ConTeXt source to create specimen sheets out of Serif, Sans and Mono fonts. As it is, this code works with ConTeXt/pdfTex, using its default fonts.
However, if you properly setup typescripts -- a subject of a next post, rest assured -- you can generate a handy pdf of 21 specimens of your favorite font set.
It's public domain and it's yours to enjoy!