This project came about when I was playing with my son and some colored paper... he asked me to make a house, and I was only too eager to comply (one the reasons I'd wanted kids was to have an excuse for building a doll house...). But since I live in an apartment with limited space and I'm allergic to dust, I wanted a house I could fold up and put away. You can see pictures of the fruit of many hours of labor here, or you can skip ahead and make your own kitchen by following the steps in this instructable.
UPDATE April 2010:
Now you can make the whole house! It took a LONG time to put together, but finally the whole eight room, two story house can either be downloaded as a PDF file (either the whole house or room by room) by going to www.makepopupcards.com. The site has some free templates and I'm planning to add even more, so it's worth the visit.
UPDATE February 2012:
For those who prefer video tutorials to step by step instructions, just click play. The music is by John M. Davis, and was originally composed for an HBO documentary "A Matter of Taste"