Another good idea is to make friends with your neighbors. An extra set of eyes can be really useful. Its nice to know that if I'm not home someone will notice a vehicle in my driveway.
I know from speaking with a trooper that alarms are not completely effective because the criminals know that the police are usually three towns away.
^I live 6 miles from one police station, about 8 from the next one. Best response time yet: ~25 minutes