MOM 2005/SCOM 2007, with a splash of VBScript and a touch of SQL queries
Two blog posts I've seen about this important topic.
http://blogs.technet.com/smsandmom/archive/2007/12/13/network-bandwidth-utilization-for-the-various-opsmgr-2007-roles.aspx
http://blogs.technet.com/momteam/archive/2007/10/22/network-bandwidth-utilization-for-the-various-opsmgr-2007-roles.aspx
Enjoy!
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