This book is essential WebSphere administrators. Whether you are new to WebSphere or migrating from an earlier version, this book introduces new capabilities that make life easier for enterprise level sites. The book does a great job of outlining the newest capabilities and explaining why they would be useful, how to implement them and options for different environments. My focus on this book was not on capabilities important to developers but on the differences between earlier versions of WAS and v6.
As usual in IBM Redbooks, there is a huge amount of information and it's not worth printing a PDF version. It's a must have for your bookshelf.