Chad Fowler has been a software developer and manager for some of the world's largest corporations. He recently lived and worked in India, setting up and leading an offshore software development center. He is co-founder of Ruby Central, Inc., a non-profit corporation responsible for the annual International Ruby Conference and The International Rails Conference, and is a leading contributor in the Ruby community.
What it says on the cover : 70 solutions to common problems. The recipes seems less advanced to me than what you'd find in most of O'Reilly's Cookbooks, for example, but they're varied enough and the short time you'll need to read the book will probably prove profitable.
This book was a recipe to boost my knowledge of Rails development. Sometimes it has simple recipes, sometimes i get stuck with more complicated ones. All in all, I loved it.