Last month update 1 of NetBeans Platform for Beginners was released, so, logically, we now have update 2 because the authors have a monthly schedule of releasing updates. Everyone who buys the book receives an e-mail at the end of each month with a link to a free new version of the book, with updates and enhancements and other changes or fixes done to the book over the past month.
Below you see the key parts of the latest update, i.e., all provided by readers of the book via e-mail or via the feedback page.
Without any question at all, this is the best book to get if you want to get a thorough and complete start to the NetBeans Platform.
Dustin Marx recently provided a very good overview of everything the book contains, so check it out if you're still debating with yourself about the value of this book: http://marxsoftware.blogspot.nl/2014/04/book-review-netbeans-platform-beginners.html