These have just been released by Microsoft:
- SQL Server 2008 Release Notes
- SQL Server 2008 Analysis Services Datasheet
- SQL Server 2008 Predictive Analysis Datasheet
- Microsoft SQL Server 2008 Upgrade Advisor
- SQL Server Data Mining Add-ins for Office 2007
- Microsoft SQL Server 2008 Feature Pack, August 2008
- SQL Server Reporting Services Add-in for SharePoint Technologies
