Some excellent technical resources around Forefront Security can be found at the new TechCenters.  Get your hands on the trials today and start testing. 

Forefront Client Security TechCenter
http://www.microsoft.com/technet/clientsecurity/default.mspx
 
Forefront Security for Exchange Server TechCenter
http://www.microsoft.com/technet/forefront/serversecurity/exchange/default.mspx
 
Forefront Security for SharePoint TechCenter
http://www.microsoft.com/technet/forefront/serversecurity/sharepoint/default.mspx