Building Mapnik on Windows

This is just a short note to folks who may be interested in building Mapnik on Windows.  I've posted some detailed notes on the build steps here.  Copies of the source code that I fetched to build with are in that same Sandbox folder (forgive me for making entire copies of source trees, but I wanted to have the exact versions that I built against in case we ever need them for debugging).   I built under Visual Studio 2005, but it would probably be easy to adapt these notes to later versions of Visual Studio.  (Thanks to Ben Moore whose notes from a few years ago were very valuable in the process.)