Of course I'm biased so we'll get that out of the way first.
The Wrox Professional SQL Server 2005 Reporting Services book is a second edition of the 2000 product edition from three years ago. It is largely written from lessons learned and real-world experience by the four authors who live day-to-day using Reporting Services for consulting projects. I wrote four chapters on report design. Chapters 4 & 5 will be similar to some existing beginning level books. Chapter 6 contains material you may find in part in some of the more advanced books. I'm not aware of any other book that contains advanced report design techniqes and examples I've included in chapter 7 (report design patterns and recipes - 90 pages.) You will not find this material by presing F1. Many step-by-stap walk-throughs and all of the reports, queries and code are available on this site.
Paul Turley, MCSD, MCDBA, MCT, MSF Practitioner