You're probably familiar with a Wiki - a document set that anyone can edit. Did you know TechNet (Microsoft's source for technical professionals) has one? And did you know there are lots of folks keeping it up to date? Well, Rick Byham, one of my friends over in the SQL Server group has posted a bunch of security checklists - and you know how much I love checklists! You can go to the Wiki here: http://social.technet.microsoft.com/wiki/ and search for "Checklists", but here's what he's posted to get you started:
Database Engine Security Checklist: Encrypting Sensitive Data
Database Engine Security Checklist: Enhancing the Security of Database Engine Connections
Database Engine Security Checklist: Limiting Access to Data
Database Engine Security Checklist: Database Engine Security Configuration
Great TechNet Wiki articles! Go Wiki Go!