The Ultimate Author/Illustrator Map of Residence

Let's discuss whether or not this would be a good idea or a bad idea. What if there were a database, map, website, or other useful online listing of all the children's authors and illustrators out there organized by their place of residence? I ask you this because many times I've found that residents of a particular area of the country, be it Virginia, California, or Pago Pago, would like to invite an author or artist to their school but aren't entirely certain who's local.

I think this might be beneficial to everyone. It would give people working in the field more exposure. It would allow schools, bookstores, and libraries the chance to meet up with their local celebrities. Everyone would benefit.

Does such a thing exist or are we going to have to make it ourselves? And is it even a good idea? Thoughts on the matter?