The first public release of Rails Rescue Handbook, version 0.8, is for sale on Lulu for $9.95. As the version number indicates, I don’t consider this the final release of the book. But there’s plenty of good content there already, and purchasers will be entitled to upgrades for the life of the book: simply buy a copy and register it here for access to future downloads.
Should be required reading for doing client work in Rails. No fluff or theory; packed with practical tips.