i will add my guide to the php wiki notes

http://mapopa.blogspot.com/2009/09/building-firebird-extension-for-php-53x.html

also i have created small notes for building firebird 2.5 soon rc with vsc9

http://www.nabble.com/building-head-with-visual-studio-2008-(vc9)-to25620414.html

I guess it's easy to backport the solutions on 2.1.3 (my guess is just
to open the vcs8 solution and save them in vc9 directory)

I will cleanup in cvs the notes for building firebird too
http://gitorious.org/firebird-head-mirror/firebird-head-mirror/blobs/raw/master/doc/README.build.msvc.html