The System Center Configuration Manager 2007 R3 RC is now available for download on Microsoft Connect. It includes R3 version 6556 with Client version 6492.
Also check out the new Powerspy tool availabe since the beta refresh.
What is power spy?
Power Spy is a client tool provided with Configuration Manager 2007 R3 which allows administrators to view and troubleshoot power data on R3 client computers. It has the ability to connect local or remote R3 client machine.