I am a big fan of checklists, besides "reminding" us of steps to do or take, it creates a kind of standardization for work being done.
Pilots use checklists even they have thousands of flying hours and are highly experienced. Why? We are only human, we can make mistakes.
Therefore brings me to introduce a cool link that provides security checklists from Wireless to Windows. Download them and run them against your implementation.
Checkout http://iase.disa.mil/stigs/checklist/index.html
Happy securing.