An idea for an smartphone app (or super mobile friendly website):
I would love to have an app that let’s you search by dietary restrictions and then tells you what you can get at nearby restaurants.
For example if I wanted Atkins diet I could search my local area and see all the food choices that are Atkins friendly.
If I wanted to search for vegetarian it would show all the possible meal choices that are vegetarian.
And an ultimate feature would be to combine diets for groups or family members.
So if I need a gluten free meal and my wife wanted low sodium we could have an instant list of where we might be able to get both.