I am learning more about BLENDER – a powerful open source 3D program. The more I learn about this program the more I like it. It’s just a pity the interface has such a steep learning curve, beyond other more well known [and very expensive] programs. But don’t be deterred if you are thinking of learning it! There are masses of YouTube vids, websites and communities devoted to sharing the wealth of knowledge; as well as the excellent books and DVDs that you can buy to help fund more development of the tool, see what can be achieved with it and use the free source files to have a go yourself.
Check out the projects that have been created using Blender: http://www.blender.org/features-gallery/blender-open-projects/