Not sure how I missed this on 4/7/2009, but SP1 is now available for SQL Server 2008. Important to some are change to the deployment and management options of the SP.
- Slipstream – You are now able to integrate the base installation with service packs (or Hotfixes) and install in a single step.
- Service Pack Uninstall – You are now able to uninstall only the Service Pack (without removing the whole instance)
- Report Builder 2.0 Click Once capability
Beware, known issues to check BEFORE installing. 
| KB ID | Summary |
|---|---|
956139 |
Visual Studio 2008 SP1 may be required for SQL Server 2008 installations |
956718 |
FIX: A MERGE statement may not enforce a foreign key constraint when the statement updates a unique key column that is not part of a clustering key that has a single row as the update source in SQL Server 2008 |
956427 |
You cannot add a cluster node when you install SQL Server 2008 Analysis Services and you do not install the SQL Server 2008 Database Engine |
956005 |
The status indicator for a SQL Server 2008 mirror database differs from SQL Server 2005 |
955949 |
Cluster upgrade to SQL Server 2008 fails when SQL Server 2005 cluster nodes have different installed features |
955396 |
How to troubleshoot SQL Server 2008 Setup issues |
956138 |
You cannot upgrade a non-English instance of SQL Server 2000 Reporting Services to SQL Server 2008 Reporting Services |
955399 |
If upgrade to SQL Server 2008 fails, uninstall the upgrade before retrying the upgrade |
955973 |
You might receive this error message when you try to upgrade to SQL Server 2008 on a computer that is running Windows Server: “Access to the path ‘<Path>\perf-MSSQL$SQL2008sqlctr.dll’ is denied” |
955389 |
How SQL Server 2008 updates what feature usage data to collect |
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