First-time gist user -- sorry if I make mistakes in reporting.
Basic issue: I can get Homebrew to install software from any website except Sourceforge (specifically this website: http://sourceforge.net/projects/machomebrew/files/Bottles/). Installing other software may require dependencies that are found on this website (i.e. cmake, pkg-config) and the typical installation of such software fails.
I've been through the usual procedures. My 'brew update' says I'm already up-to-date. The output of brew doctor and the install are the following:
/usr/bin/curl -qf#LA Homebrew 0.9.3 (Ruby 1.8.7-358; Mac OS X 10.8.2) https://downloads.sf.net/project/machomebrew/Bottles/cmake-2.8.9.mountainlion.bottle.tar.gz -o /Library/Caches/Homebrew/cmake-2.8.9.mountainlion.bottle.tar.gz