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I contacted M&M/Mars to see if they had a list of gluten free candies.  They said they do not give out a list because they do not want people going by an outdated list if their formulas change.  But she did say that they clearly list their ingredients and do not hide gluten under 'natural flavors' or anything else.  Also, she read me a list over the phone of products that are currently gluten free:

Skittles
Starburst
M&Ms (except crispy)
Dove Chocolate
Snickers
Dove Ice Cream
3 Musketeers
Milky Way 'Midnight' (ONLY)
Snickers Ice Cream
Snickers Munch

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