Inserts an HTML comment at the beggining and ending of html partials with the path to the partial, so that "view vource" can tell you exactly what partial is responsible for the piece of HTML you're looking at. Limited to files ending with .html,.haml,.erb, and .rhtml and Rails 3.0.x ONLY. See https://github.com/gwshaw/noisy_partials for a 3.1 compatibile version
Gemfile gem 'noisy_partials_for_rails_3', '~> 0.0.2'
install gem install noisy_partials_for_rails_3