This book is the update to Oracle Warehouse Builder 11g: Getting Started. I have had a review of this earlier version of the book a while ago on the blog. One of the issues I had with the book was that it only covered OWB 11g R1. Bob Griesemer has now addressed this with his new book.
As the title suggests the audience for the book are newcomers to the world of data warehousing and Oracle Warehouse Builder. If you have experience in this field this book is not for you. However, if you are a complete novice you should have a read.
You can also purchase Oracle Warehouse Builder 11g R2: Getting Started 2011 directly from the publisher.
One of the reviewers of the book is David Allan from Oracle. This should guarantee a high quality read.