If you like—or don’t like—this book, by all means, please let people know. Amazon reviews are one popular way to share your happiness (or lack of happiness), or you can leave reviews on the site for this book:

There’s also a link to errata there. Errata gives readers a way to let us know about typos, errors, and other problems with the book. The errata will be visible on the page immediately, and we’ll confirm it after checking it out. O’Reilly can also fix errata in future printings of the book and on Safari, making for a better reader experience pretty quickly.

We hope to keep this book updated for future versions of Rails and will also incorporate suggestions and complaints into future editions.