Question: what's the current accepted term for the "mental retarded."

[Pab Sungenis]

I'm making fun of the Obama/Special Olympics flack in next week's "Queen Victoria," and not wanting to be offensive myself, I wanted to ask this question. And with the poutrage going on over the Special Olympics quote, I thought it might be a good time to ask the question.

What is the proper, descriptive, non-offensive, accepted term for what we used to call "the retarded" when I was growing up? The word has taken on some amazingly negative overtones over the years, and I'm sure there must be a better term that I'm not aware of.

This is a serious question, not aiming to start a flame war. What is the correct term to use to avoid causing unintended offense?

And if you're planning to post an offensive joke response, please piss off. Thank you.