In order to help consolidate information on what businesses/places allow firearms, I created a free website at
www.armedcarry.org. Please take a look and start posting businesses you know either allow, or don't allow, the carry of weapons. Soon, this information will be pushed to an iPhone app that will send a notification on your phone when you approach a prohibited business. I've posted a couple of places in Lincoln as an example.
Right now, I've only created Lincoln and Omaha in Nebraska, but will add towns/cities as needed. I have a few major towns in Oklahoma as well since I used to live there and will be letting them know about the website too.
Please let me know your thoughts!