IntelliJ IDEA in Action

I picked this book up since a lot of developers at the office are using IntelliJ IDEA. As of this posting, IDEA version 9 was just released. Even with this dated book, I was able to come up to speed pretty quickly on IDEA. A lot of this book covers the obvious, so some experienced developers will jump over big sections of the book. However, for a book on an IDE, this one is pretty good. Much of the features in IDEA remain intact, however there's an ever-growing bucket of new features and changes. This book primarily focuses on IDEA 4.0, with special sections on 5.0. With all the new additions since then, this book is quickly becoming out of date.