The following technologies and categories have had new topics added or existing topics updated with significant changes in the 29 June 2009 release of SQL Server 2008 Books Online.
Database Engine: New and Updated Topics (29 June 2009)
Replication: New and Updated Topics (29 June 2009)
Analysis Services - Data Mining: New and Updated Topics (29 June 2009)
Reporting Services: New and Updated Topics (29 June 2009)
Integration Services: New and Updated Topics (29 June 2009)