A revised version of Rails Rescue Handbook has been released. Version 0.9 cleans up various formatting and design issues from the first release, and adds some new content as well. If you’ve already purchased your copy, log in to this site and follow the “Download updates” link in the menu bar to get your update.
Rails Rescue Handbook covers everything from how to get what your client really wants to getting your app to perform faster and is essential reading, even if you're not in the process of rescuing an application