Organizations:
American Donkey & Mule Society
NASMA
Western Mule Magazine

Educational/information sites:
The Farrier and Hoofcare Resource Center 
Healthcare Index - Horses - Net Links

Training:
Brad and Shari Cameron Mule Company
Steve Edwards Queens Valley Ranch

Free classifieds:
The Hay Net 
AgDirect Horse Classifieds 
American Horse Network Search Engine 
Horseified Ads 
LookHorse.com : Classifieds 
Online Horsetrader 
The Dream Horse Classified 
WesternWeb.com 
Web Pony Search Engine 

Fun links, ranches and services:
Mule Trader
Heart B Mules
Classic Equine Web Design
Gary's Custom Saddlery & Silver
OK Longears
Kicking Donkey Products 
Dana Gookin Photography