## just slap this in your rake file or in lib/tasks

namespace 'views' do
  desc 'Renames all your rhtml views to erb'
  task 'rename' do
    Dir.glob('app/views/**/*.rhtml').each do |file|
      puts `svn mv #{file} #{file.gsub(/\.rhtml$/, '.erb')}`
    end
  end
end

## or if you have rhtml and rxml you could probably use the following (untested)

namespace 'views' do
  desc 'Renames all your rhtml views to erb'
  task 'rename' do
    Dir.glob('app/views/**/*.rhtml').each do |file|
      puts `svn mv #{file} #{file.gsub(/\.(rhtml|rxml)$/, '.erb')}`
    end
  end
end