Security seems to be a common stumbling block - particularly for those who need to harden security beyond what we provide in the default setup.  The Security Hardening Guide has just released and is a great reference for those of you in the security trenches! 

 http://www.microsoft.com/downloads/details.aspx?FamilyID=244512ab-7419-4c93-8046-9c8e47e0f780&DisplayLang=en