A little while ago, I published a blog entry around end-user security. Since then, I've been asked many questions from customers & partners on SharePoint security in general. From hardening servers to server farm architecture. I wanted to point out an excellent, comprehensive SharePoint Security guide that was recently published: http://go.microsoft.com/fwlink/?LinkID=94375. So whether you're looking for comprehensive security guidance or information on a specific topic, this resource is super helpful for all things SharePoint Security.