pocketmod is clever idea based on folding up a bit of paper. Who knew it could be so compelling. There's life in the old dog yet ;-)
My kids love the neat and tininess of them. There's something in the soul of little children that loves a notepad/booklet all your own. This fits the bill so totally.
And on a paper-folding tip - paperplanes like these are irresistible to my six year old son. I love the fact that they went to the trouble of doing an animation as well!