Home Owner, Grand Rapids, MI
When you are in Trulia, put in the exact address of where you want to live. Click on the "Crime" tab to see the number and type of crimes in that area. I'd also suggest contact the police chief in the area you want to relocate in and his him or her. Also, stop a mailman in the area who is delivering mail. Ask them what the neighborhood is like. The mailman in my area told me everything from the age and type of people who live in my area to the type of dirt in the area I wanted to live.
Also, if you see a friendly-looking store owner or homeowner in the area, try to ask them.
(not a realtor)