I'm always on the lookout for a clever, fun pop-up book. The Castaway Pirates (Chronicle Books, 2008), written and engineered by Ray Marshall and illustrated by Wilson Swain, is among my favorites. The book's jaunty rhyme is very funny and ends with a lucky twist, and the pop-ups and art have unique styles. On his website, Ray Marshall posted a great explanation of how his book was made, from the original idea to the final production. If you're curious about the process of making a pop-up book, I recommend it!