The Operations Manager 2007 Performance and Scalability Guide has been updated to include Audit Collection Services sizing information. The updated guide is available on TechNet (http://technet.microsoft.com/en-us/library/bb735308.aspx) for browsing and the Download Center (
http://www.microsoft.com/technet/opsmgr/2007/library/proddocs.mspx#EIDAC) for download.