Oh, OneSock, please forgive in advance my powers of description...
A whirlypop is a large aluminum pan with a hinged lid on top and a stir-thingy that runs through the handle, hooking to a gear that turns some wire doohickys inside along the bottom of the pan, constantly stirring the popcorn by turning the crank on the handle. Help me someone! There is probably a link out there somewhere....hold on a minute, maybe the recipe book included a link...
yep, here it is:
http://www.popcornpopper.com
Anyway, it makes really great popcorn with as little as a teaspoon of oil - you can make sugar corn or carmel corn or whatever else you like in it also. Love my whirlypop.