The CTP version of SQL Server 2008 Service Pack 1 (SP1) is now available. You can use these packages to upgrade any SQL Server 2008 edition.
One of the most significant SSRS-BI impact on this SP is the Report Builder 2.0 Click Once capability.
In order to use it directly from report manager, click on 'Site Settings', and then set 'Custom Report Builder launch URL' to '/ReportBuilder/ReportBuilder_2_0_0_0.application'
Download and try it.
Bye
Ronen