I also purchased Brian's book on SQL Server 2005 Reporting Services and moved up to 2008 and the book is an excellent step-by-step recipe book on how to create reports utilizing SQL Server 2008. It is an excellent book on stepping you through the numerous examples and examining how to create complex business reports.
Another great point is that when I was learning SSRS 2005 and had a problem, I emailed Brian, figuring I might hear back from him in a week or so. He replied to my email within the day and explained to me what I had to do to correct my problem. Best of all, it was right and I moved on.
His writing style is clear and concise and he doesn't miss any steps in his tutorials on creating the reports. This is one book that will be "dog eared" due to heavy use.