The Live Edition of Learning Rails starts with an update of the book from Rails 2.1.1 to Rails 2.3.5. Code that changed over the past year or so has been cleaned up, as have errata that shouldn't have been there in the first place. Easy approaches to installing Rails that proved to be dead ends have been removed, while new material on jQuery has been added. The text has also been improved to make fewer assumptions that readers have gone through it in sequence, with reminders added about steps whose omission can cause strange problems. The forward-looking sections of the book include more recent information about the upcoming Rails 3. O'Reilly Live Edition books give you access to updates to topics in between editions of a book. A Live Edition is an electronic version of the book that is updated when there is a significant change to the software or technology the book covers, keeping you on top of .X releases or major fixes.