How to Carve Freakishly Cool Pumpkins (Halloween Extreme) - Sarah L. Schuette
This book gives instructions on how to 11 different carvings on pumpkins. And all of them are pretty cool. I'm not sure which was my favorite, but the Witches Cauldron was definitely neat looking.

If you're looking for different ways to carve a Jack-O-Lantern, check out this book.