Google SketchUp (free) is an easy-to-learn 3D modeling program that enables you to explore the world in 3D. With just a few simple tools, you can create 3D models of houses, sheds, decks, home additions, woodworking projects - even space ships. And once you''ve built your models, you can place them in Google Earth, post them to the 3D Warehouse, or print hard copies.