Rob Orsini released the new Rails Cookbook from O’Reilly, just in time for Rails 1.2. Just from looking at the table of contents, it looks like there’s a lot of good information packed in this book.

This book is packed with the solutions you need to be proficient
developer with Rails, the leading framework for building the new
generation of Web 2.0 applications. Recipes range from the basics,
like installing Rails and setting up your development environment, to
the latest techniques, such as developing RESTful web services. Each
recipe includes a tested solution, plus a discussion of how and why
it works. — from the book’s Full Description