This came by way of a virtual friend from tappedin.org Popcornica is where you'll find science, history and the answers to everything you've ever wanted to know about popcorn but were afraid to ask. The site is ready to be linked to your curriculum with a teachers guide and lesson plans.
Having a party at the end of the term celebrate with a unit related to popcorn. Pop corn and use it as a fund raiser. Just one of the many ideas for integrating this site.
The Popcorn Book immediately comes to mind as a first resource. It is written and illustrated by Tomie dePaola., one of my favourite authors for kinders and above.
Take a look at Popcorn Storytime Resources for a popcorn bag full of ideas!
As an additional reference I am hooked on TOMIEdePaola
books especially the award winner, Strega Nona.