Edge Rails
Howto get an edge rails project up and running without having to “upgrade” a gem rails project:
mkdir -p my-edgey-project/vendor && \
svn co http://dev.rubyonrails.org/svn/rails/trunk my-edgey-project/vendor/rails && \
ruby my-edgey-project/vendor/rails/railties/bin/rails my-edgey-project