This page is part the Sage on Windows port.
MSVC 2005 in 32 bit mode
MSVC 2005 support is the main goal since Python 2.5 uses it as the default compiler on Windows.
MSVC 2008 in 32 bit mode
MSVC 2008 support should be investigated since Python 2.6 and Python 3K will switch to it as its default compiler on Windows.