Note: This post has been amended as I originally stated that SCCM was at RTM - apologies for the confusion
The folks in marketing would probably shoot me for stating that SCCM is effectively SMS v4 as the product takes a much broader view of the environment.
You can download a copy for yourself via the Microsoft Connect website..
Rob includes the following description on his post:
"With major investments in simplicity, configuration, deployment and security, Configuration Manager 2007 dramatically simplifies system deployment, task automation, compliance management, and policy based security management allowing for increased business agility."