Assume that you know that SEO is web speak for search engine optimization. Under the covers there's all this "code", the algorithms that remember stuff, find stuff, and miraculously give you want you actually want or might possibly want when you Google it (or Bing or Yahoo it).
The beauty of Craigslist and other New Age indexes is that they can be localized. You know, I am not interested in seeing a list of refrigerators in Long Island when I live in San Diego.
Local SEO IS a hot topic, especially if the global Social Media services take advantage of it.
5 Reasons Small Business Should Love Local SEO - Search Engine Watch (#SEW)