After about a month in beta and having received no complaints, I've promoted the RMagick 1.15.9 Win32 gem to production status. If you've already installed the beta you DO NOT need to install the production release. The only differences between the beta and production releases are a few edits to the README.html file.
Please note that the RubyForge package is called rmagick-win32.
RMagick-1.15.9 for Win32 is the first new release of RMagick for Windows since last November. Here are the Release Notes:
WIN32-ONLY: The rmagick-win32 gem is for Win32 installations. If you want to install RMagick on some other O/S, use the plain rmagick gem.
PREREQUISITES: This gem is bundled with a version of ImageMagick that must be used with this version of RMagick. Do not install a different version of ImageMagick.
INSTALLATION: This gem may not be installed remotely. Download the zip file and unzip it into a temporary directory. Then follow the instructions in the README.html file to install both ImageMagick and RMagick.
As always, RMagick is available from RubyForge: http://rubyforge.org/projects/rmagick/.
RMagick is an interface to the ImageMagick (www.imagemagick.org) and GraphicsMagick (www.graphicsmagick.org) image processing libraries. RMagick supports more than 100 image formats, including GIF, JPEG, PNG. The rmagick-win32 gem includes comprehensive HTML documentation.
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RMagick OS X Installer [http://rubyforge.org/projects/rmagick/]
RMagick Hints & Tips [http://rubyforge.org/forum/forum.php?forum_id=1618]
RMagick Installation FAQ [http://rmagick.rubyforge.org/install-faq.html]