www.cheesesociety.org This trade association (ACS) has a good deal of useful information on its site, including a membership directory that lists not only cheesemakers, but specialty retailers as well.
www.cheesemaking.com In case you need another hobby. Honest, the microwaved mozzarella is like a miracle!
The Atlas of American Artisan Cheese, by Jeff Roberts. This is the first book to cover the subject in any detail, and is a must-have for any American cheese adventurer.
Cheese Primer, by Steven Jenkins. Good introductory book on the pleasures of cheese. Fairly Eurocentric.
Home Cheese Making: Recipes for 75 Delicious Cheeses, by Ricki Carrol. If you can brew your own beer, you can make your own cheese.
American Farmstead Cheese: The Complete Guide to Making and Selling, by Paul Kindsedt. So maybe you want to get into the cheese biz?