Pepakura Designer allows you to create paper craft models from 3D data. Note that Pepakura Designer does not contain software to create the original 3D models, but instead translates them to a 2D printable format. A colleague used this to create HALO armor costume for Halloween.

Online Math Adds Up to a Lot of Fun

DreamBox Learning delivers fun math lessons. Kids can choose from the site's four themes (pets, pixies, pirates, and dinosaurs) and complete math-related tasks to earn objects that help the animated stories progress (earn a hammer to repair a pirate ship, for instance). With about four games per task, six tasks in each story, eight stories in a theme, and four themes ... well, that adds up to a lot of fun math. After finishing a story, players earn a certificate. The site's Parent Dashboard continually assesses and informs parents of kids' progress, all while making real-time adjustment to their math level.
(source: FamilyFun magazine)