Book: Foundations of SQL Server Business Intelligence
I enjoyed Lynn Langit's book: Foundations of SQL Server Business Intelligence. It takes a fairly interesting tour through the current Microsoft SQL Server BI stack, covering Analysis Services, Integration Services and Reporting Services. The writing style is good although I suspect one or two areas reflected Lynn's experience with previous versions of the product. Lynn provides a good amount of sound advice.
Recommended for those looking for an intro into the SQL Server BI space!