First of all, I have watchful neighbors who are home all day (for the most part). Of the 16 houses on this street (8 on each side), over half of us are home during the day. We all look out for each other and call/go over when we notice something suspicious.
Four-legged friends are always helpful. They are a great alarm as they will warn you of anyone approaching the house, the neighbors' houses, the street behind us and the street in front of us, etc.
There is always someone around whether it be DBF, DDs, family, friends, etc.
I used to live in a real poor area of town. I actually felt safer there as common sense dictates that there is really nothing to steal from the poor as we don't have it.