This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
A lot has changed--i fact much of the book has been rewritten. We use migrations, Ajax, mention REST, RJS, look at :through associations, and on and on. I'll let others who have both editions comment on whether the upgrade it worth it.