SQL Server 2008 Service Pack 1 (SP1) is now available. You can update any SQL Server 2008 edition.

Service Pack 1 (SP1) contains all the cumulative updates and fixes issued since SQL Server 2008 was released in August 2008. It also makes it easier to deploy SQL Server 2008.  A few specific features have been added:

• A feature called Slipstream allows users to install the database and service pack at once, easing the process of loading the software onto hundreds or thousands of servers.
• Report Builder 2.0 Click Once eases deployment.
• Service Pack Uninstall is designed to allow administrators to uninstall the service pack separately from the database release.

You can get the download from SQL Server 2008 Service Pack 1.