Folks who have known me for a while have probably heard me carry on about the "r-word" at some point. I had no idea that my personal carrying on had a national campaign. Today is designated as the annual day of awareness for using (or not using) "retarded." You can learn more at r-word.org (their site is very slow, maybe just today) and I encourage you to check it out. This is personal to me as I have a 14-year-old son with Cerebral Palsy and severe Developmental Delay. He is an individual with an intellectual disability. Retardation is a literal description of a medical condition. It has come to be used as an insult or joke. I appreciate you considering eliminating it from your vocabulary. If you really want to go above and beyond, pay attention to how you use "special" as well.