Opencarry.org is a great open carry resource as well, particularly the state specific forums.
I also open carry routinely, the attitude of "I want to scare people" is why people get nervous around responsible gun people.
I do to show a good example of gun ownership and because I have the right to do so and it feels nice to not be in hiding all the time. It gives me the opportunity to talk to fence sitters, opportunities I would not have if I were not open carrying.
If I am open carrying I go about my business normally and have been in hundreds of stores and haven't had any real problems I have had a lot of people smile, nod, ask me what I'm carrying, ask me to reach stuff on a high shelf, etc.
If you open carry be ready to answer questions in a non aggressive and friendly way.
"Because I can" while a valid answer is not the best response to "why are you carrying a gun." The person has shown interest and your response will affect how they see other gun carrying people, we all represent each other.