The alternate site worked! I successfully downloaded rmagick. Unfortunately (didn't you just know there'd be an 'unfortunately') I now get this error when I do a gem install with rmagick;
gem install rmagick -i ~/.gems
Bulk updating Gem source index for:
http://gems.rubyforge.org/Building native extensions. This could take a while...
ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.
/usr/local/bin/ruby extconf.rb install rmagick -i /home/MYSITE/.gems
checking for Ruby version >= 1.8.2... yes
checking for gcc... yes
checking for Magick-config... yes
checking for ImageMagick version >= 6.3.0... yes
checking for HDRI disabled version of ImageMagick... yes
checking for stdint.h... yes
checking for sys/types.h... yes
checking for magick/MagickCore.h... no
Can't install RMagick 2.5.2. Can't find MagickCore.h.
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.