What's the difference between SMS 2003 and SCCM 2007?

WSUS instead of ITMU  Better Remote control feature  Wake on LAN feature  Secure connectivity in Native mode  SCCM can talk to clients over the internet without the need of a VPN 

Please refer: https://technet.microsoft.com/en-us/library/bb680807.aspx

SCCM2012 is the latest version of SCCM and service pack2 for it is about to get released.