Satya Vel has posted a good entry on the Operations Manager Product Team Blog concerning Network Bandwidth Utilization for the various OpsMgr 2007 Roles. As a follow-up to Satya's comments on bandwidth utilization, I have posted the below graphic illustrating bandwidth used by 150 agents of each MOM version (MOM 2005 and SCOM 2007). Excellent improvement to say the least. Now if they would only resolve the console performance....
http://helpmemanage.googlepages.com/MOMvsSCOMUsageovertime.JPG