I was poking around on the Librarians' Internet Index to scope out its marketing resources, and I found a few things you might be interested in that have some general applicability:
- The Library of Congress' Market Segmentation guide has, "books and other resources that discuss marketing to particular segments of the population along with other sources that are important in determining the size and power of a particular market segment." It includes generational, ethnic, geographic and other segments (complete with LC Subject Headings, of course!).
- HispanSource is, "is your one-stop source for information related to the U.S. Hispanic/Latino community. Use HispanSource to develop sound business plans, marketing plans, and sales strategies."
- AdCracker: I have only just begun to play with this resource, but it looks promising. While the site is devoted to selling the AdCracker software, there are some neat free features that help to unleash some of that advertising creativity bubbling beneath the surface.