Per this email,
This is just to let you know that Agile Web Development with Rails, Third Edition (PDF) has recently been updated. You own a PDF version of this book, and so you’ll be able to request and download this latest version.
Changes in this version include:
Five new chapters were updated to Rails 2.0: Depot Administration, three chapters on ActiveResource, and the chapter on routing and URLs. Numerous errata and a number of forum comments were addressed. In particular, installation instructions on Mac OS X Tiger were updated. A number of screenshot images were refreshed.
There should be 3 chapters on ActiveResource in the latest PDF… but I don’t see them… did the gerbils run out of energy?