Apparently, this is different than National Popcorn Poppin' Month, which was back in October. That month you had to pop the corn yourself. Today I guess you just have to eat it.
Popcorn.org has a bunch of recipes and popcorn facts, while Kraft has a recipe for Chocolate Popcorn Trail Mix. Simply Recipes tells you how to make what they call Perfect Popcorn. If you want to make popcorn in your microwave (but don't want to just throw in a bag of microwave popcorn), All Recipes shows you how. If you don't feel like making popcorn, you can read about the history of Jiffy Pop.
And don't forget the Honey Popcorn Balls Marissa told you a few months ago.
October is 
Soy and chickpeas might help stroke victims
The world of pie and tart crusts
Starbucks launches the Piadini 
