O'Reilly has posted chapter 9 of JBoss: A Developer's Notebook. This chapter covers how to take a JBoss server into production, configuring and securing the more critical services. I think it is representative of the level of information in the book. If you are still on the fence, the book is in print now. O'Reilly will have copies at JavaONE next week, and it should start popping up on the shelves within a few weeks of that. If you are a JBoss user, take a look.