Great website referral by James.
One item I would add is to compare crime rates in various locations. If you just focus on the crimes and rates in your search area it will scare you. Every area, whether high end community or low income neighborhood has it's issues. Once you compare multiple locations it will give you a better perspective on what the crimes are, how often they occur and if it's something you can live with. Because the reality of our world is that we all live with it around us.