Fast forward to the present - the July challenge at the "Enjoy Michael Strong stamps" yahoogroup is to make an exploding card. Now, to remember the fold... a Google search of explosion cards did not produce the result I remembered. Who was that guy? Could it be... Michael Strong? I decided to google "Michael Strong Carol Duvall" and got this result: http://scrapbooking.com/article/74222 .
He doesn't even call it an explosion card in the tutorial, but that's what it is! Here is my version: