Printable Havannah boards

I'm sure someone has done this before, but I couldn't find any high-resolution Havannah boards online, so I whipped up some DSC-compliant PostScript to draw seven printable Havannah boards (from size-4 up to size-10 in one PDF file). Source code is available at http://github.com/zmxv/havannah-boards/blob/master/havannah.ps in case you need to customize the look-and-feel.