There are several more important (but mostly invisible) differences:
* All common libraries are (zlib, png etc) are rebuilt and given a unique name to avoid DLL hell.
* All packages are re-built using Visual Studio 2008 (no mingw DLL as used) avoiding the mixed C Runtime libraries problem.
* Optional dependencies are provided (where possible) - for example netCDF4 is built with OpenDAP support
* All packages include their documentation in native win32 htmlhelp (where possible).
* MKL optimized where needed (numpy, scipy etc).
Its good to have a choice :)
-gabi