I've got it on my phone, and as it's a brand new app there's not much data available in my neck of the woods. To my mind, it's a great idea and I'll be populating the data for my area.
http://www.examiner.com/article/app-lets-consumers-network-to-id-gun-free-zone-businesses
http://www.gunfreezoneapp.com/
http://www.examiner.com/article/app-lets-consumers-network-to-id-gun-free-zone-businesses
http://www.gunfreezoneapp.com/