This week's book giveaway is in the Other Open Source APIs forum. We're giving away four copies of Storm Applied and have Sean Allen, Peter Pathirana & Matthew Jankowski on-line! See this thread for details.
Alaa is right - my book talks specifically about using Ruby for business reporting. It covers extracting data, analyzing it, and then displaying it. For example, it shows how to use ActiveRecord and various graph libraries to represent data in a ton of different ways: in a PDF, as a desktop application, as part of a web application, and more.