Google Sketchup is a powerful 3D modelling tool. It is very quick to pick up and use. The online video tutorials are excellent and get you started really quickly. You'll be creating some amazing 3D images in no time. There is also the facility to creat animations of your models - you can also import objects that other people have created, or that you have created previously.
Ade's Comments:
Good fun to use. I have created a few models for use with some website work (see my artwork page). The intuitive interface and simple controls make this a joy to use for all ages. You can create objects to exact sizes in the design areas.
