With the major release of System Center 2012 and soon to be Service Pack 1.
Microsoft has updated the End-of-life of its former System Center 2007 products.
Configuration Manager 2007 SP2
Operations Manager 2007
Data Protection Manager 2007
Service Manager 2010
System Center Virtual Machine Manager
And with the release of Windows Server 2012, System Center 2012 with SP1 is the only viable option.