Recently, a php_imagick.dll has been released [1]. I downloaded the Imagemagick binary for Windows and installed it [2]. Then I copied all CORE_*.dll files to winntsystem32 and put an extension=php_imagick.dll in the php.ini. That got imagick running as extension in PHP, as far as I could see in phpinfo().
So if You can have a look at it, the developpers will appreciate any comments of running systems, since this is all EXPERIMENTAL yet [3].
[1] http://php.chregu.tv/php_imagick.dll
[2] ftp://ftp.imagemagick.org/pub/ImageMagick/binaries/
[3] http://pear.php.net/manual/en/pecl.imagick.php
