Not to be outdone by Starbucks Coffee Break, Dunkin Donuts will be "putting winter on ice" with their nationwide Free Iced Coffee Day on March 21st. You can grab your free cup of iced coffee at any participating Dunkin Donuts in the country. You can read the press release for details. Two huge free coffee giveaways in one month? Great minds think alike? I think not, more like mediocre minds steal from great minds.