I have not seen a post like this, but recently my neighbor had their truck broken into, and I got into the discussion of security. For them, they had not security beyond a single broken security light.
Some things to consider:
-Motion lights over dusk-to-dawn lights; while any light is good, motion lights are avoided because they draw attention.
-Security systems; this is very dependent on area, but even then, they are a deterrent if someone else nearby does not have one
-Security system signs; whether you have the system or now, having the signs can act as a deterrent.
-Visible Valuables; this comes into play for those who leave expensive things in view of their cars, or can be viewed through windows. It is like advertising what you have to steal.
-Dogs, any dog; while a chihuahua might not seem like a guard dog, they do alert (if trained) when someone is at the door.
-Security cameras; these are not always good for after the fact, but just like motion lights they can deter someone or make them pick a different target
-Door Reinforcement; many do not understand the weak/short screws which are holding your door in place are (1/4 inch I believe?) and that typically the frame is what cracks and not your door. 3 inch screws, into your frame are a very cheap solution
-Situational Awareness; this is the big one, over all others. So many out there will answer the door as if the person on the other side is their best friend, but the reality is that if you do not know them, they could be a threat.
So what do you think? Quick and dirty, but let me know what I missed/wrong about, I'm a little 'rusty' on the whole physical security aspect.