planning your landscaping, think like thieves and know your enemy:
trees and brnaches of trees close to your home that give burglars access to upper
your trees and shurbbery; don't give them some where to hide.
porch lights and be attentive to burned out bulbs.
a light on, preferable on each floor, when you go out in the evening.
motion sensitive lights
your lawn well maintained so that they know that the house is attended to and
low thorny bushes below your windows