Just in case you have not seen any of the blogs or announcements!

Service Pack 1 for SQL Server 2008 is now available for download here and is primarily a roll-up of previous cumulative updates, quick fix engineering updates and minor fixes made in response to requests reported through the SQL Server community. While there are no new features in this service pack, customers running SQL Server 2008 should download and install SP1 to take advantage of the fixes which increase supportability and stability of SQL Server 2008. With this service pack, Microsoft has made investments to ease deployment and make management of service packs more efficient. Key improvements in SP1 include Slipstream, Service Pack Uninstall and Report Builder 2.0 click-once deployment.

You can keep up to date with all SQL related news at the Insiders Blog: http://blogs.technet.com/dataplatforminsider/default.aspx