In May,2012, Prof. Rob J Hyndman has announced his new book about forecasting and co-authored with George Athanasopoulos. This book ,Forecasting: principles and practice, has published online in www.otexts.org/fpp/. It updates gradually, available online and free-of-charge. So, it can widely accessed more people who interest about forecasting. This book also have a forecast package for R. If you interest this book, yo can access it.