I've just uploaded a pre-compiled-for-Windows RMagick 2.0.0 gem to RubyForge. The gem is bundled with ImageMagick 6.3.7-8. Look for RMagick-2.0.0-ImageMagick-6.3.7-8-Q8.zip in the rmagick-win32 project of the RMagick download page [http://rubyforge.org/frs/?group_id=12]. Remember it takes a few hours for the mirrors to catch up. This makes 4 RMagick releases in 4 days so I'm going to stop for a while.
You can read about RMagick 2 here: http://rmagick.rubyforge.org/rmagick2.
How do you know if you should upgrade to RMagick 2? You should use RMagick 2 instead of RMagick 1 if
1) You want to use RMagick with Ruby 1.9.0. RMagick 2 works with 1.9.0. RMagick 1 does not.
2) You want to use new ImageMagick functionality. RMagick 1 maintenance is limited to bug fixes. New ImageMagick functionality will appear in RMagick 2.
3) You want to have better control over RMagick's memory usage. RMagick 2 has two new methods - Image#destroy! and Magick.trace_proc= - that can help you manage the memory used by images in your programs.
You should stick with RMagick 1 if
1) You want to use older releases of ImageMagick or Ruby.
2) You want to use RMagick with GraphicsMagick.
RMagick 2 has different prerequisites and is very slightly incompatible with RMagick 1, so be sure to read the web page before you download it.
The detailed ChangeLog is here [http://rubyforge.org/frs/shownotes.php?release_id=17446]
Please report bugs on RMagick's bug tracker [http://rubyforge.org/tracker/?group_id=12]. You can ask questions in the RMagick Help Forum [http://rubyforge.org/forum/?group_id=12], or contact me directly at rmagick AT rubyforge DOT org.
RMagick 2 is an interface to the ImageMagick (www.imagemagick.org) image processing library. RMagick supports more than 90 image formats, including GIF, JPEG, and PNG, and comes with comprehensive HTML documentation.
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RMagick: http://rmagick.rubyforge.org/
RMagick 2: http://rmagick.rubyforge.org/rmagick2.html