rails svn:externals for plugins and rails edge
svn propedit svn:externals vendor
--[sample file]--
rails http://dev.rubyonrails.org/svn/rails/trunk/
plugins/acts_authenticated http://svn.techno-weenie.net/projects/plugins/acts_as_authenticated
plugins/exception_logger http://svn.techno-weenie.net/projects/plugins/exception_logger
--[end of sample file] --
svn ci -m "added plugins and rails source to svn externals"
svn --ignore-externals stat