ShapeShop is a new 3D modeling and design tool with a fun, easy-to-learn interface. Sketch-based shape creation and editing tools make it simple to quickly translate your ideas into a 3D shape, with drag-and-drop texture compositing, a new gesture-based 3D manipulation interface, and very cool layered surface editing tools. Best of all, ShapeShop is free!

The manual is a bit slim, so you really want to check out the ShapeShop blog:

http://www.shapeshop3d.com/blog/

and forum:

http://www.shapeshop3d.com/forum/

And don't hesitate to let me know what you think at feedback@shapeshop3d.com.