Flot! For Rails! So great.
This gem adds a single generator to Rails 3, flot:install. Running the generator will copy flot to your public/javascripts directory.
The flot files will be included by the javascript_include_tag(:flot) call in your layout files.
In your Gemfile, add this line:
gem "flot-rails"
Then, run bundle install. To invoke the generator, run:
rails generate flot:install
Then put the following command in your layout/application.html.erb:
<%= javascript_include_tag :defaults, :flot %>
You're done!