Microsoft SQL Server 2008 R2 is now supported on Configuration Manager 2007 SP1 and SP2 and Configuration Manager 2007 R2
System Center Configuration Manager 2007 SP1 and SP2 now support Microsoft SQL Server 2008 R2 as a Configuration Manager 2007 site database. System Center Configuration Manager 2007 R2 now supports Microsoft SQL Server 2008 R2 Reporting Services.
Source: http://blogs.technet.com/b/configmgrteam/archive/2010/06/30/configuration-manager-support-announcements-for-june-2010.aspx