http://www.developer.com/lang/rubyrails/article.php/3889916/Generating-Open-Flash-Charts-from-Rails-Application-Data.htm
If your Rails application provides any kind of analytics related to particular data, the ability to generate charts is a very important function. Open Flash Chart provides a good interface for graphically representing your application's data, and a few Ruby on Rails plugins allow you to include Open Flash Charts in Rails applications. In his Java Boutique article, Saurabh Bhatia explains how to include Open Flash Charts in a Rails application using the stable, straightforward
PullMonkey plugin.
Generating Open Flash Charts from Rails Application Data
June 25, 2010
Read the full story at Java Boutique:
Generating Open Flash Charts from Rails Application Data