The following technologies and categories have had new topics added or existing topics updated with significant changes in the 31 October 2008 release of SQL Server 2008 Books Online.
Getting Started: New and Updated Topics (31 October 2008)
Analysis Services - Multidimensional Data: New and Updated Topics (31 October 2008)
Database Engine: New and Updated Topics (31 October 2008)
Integration Services: New and Updated Topics (31 October 2008)
Analysis Services - Data Mining: New and Updated Topics (31 October 2008)
Reporting Services: New and Updated Topics (31 October 2008)