Mikko Koppanen has a quick post about the latest Windows binary releases of two graphics packages for use with PHP 5.3 - Imagick and Gmagick.
The new Windows build page http://valokuva.org/magick/ contains builds for both Imagick and Gmagick. All builds are done using VC9 and PHP 5.3. ImageMagick builds are QuantumDepth 16 (default). GraphicsMagick builds are QuantumDepth 8 (default).
You can find these latest builds on the Windows PHP.net site along with the latest PHP 5.3 builds.