Our high tech triangle in Silicon Forest is innovating some promising new curriculum concepts in tandem with a South African group, teaching Logo, Squeak and then Python. The Winterhaven group, which I'm leading, is field testing a more geographical blend, featuring Google Earth, Celestia and Stellarium for openers. But there's also some good work with polyhedra and polyhedral / figurate numbers (e.g. triangular, square, tetrahedral and cubic sequences). This is an 8th grade level curriculum at this point, in a K|5e|3m|4h|4c K16 pipeline.