Microsoft added support for SQL Server 2008 with SCCM SP2 (R2 for upgrade from 2005 to 2008), and along with this update they also made changes to the admin console OSD driver management node (under Operating System Deployment -> Drivers). This results in an error in the Drivers node when running SCCM 2007 SP2 with SQL Server 2008.
To work around this, Microsoft has released a hotfix that updates the database so that the node displays correctly. You can get the hotfix here.
There is also apparently an error with SQL Server 2008 and SCCM 2007 R2 when using the Reporting Services. There is a hotfix for this problem as well.