Google SketchUp is software that you can use to create 3D models you like.
BSEditor: Google SketchUp is a free, easy-to-learn 3D-modeling program with a few simple tools to let you Create 3D models of houses, sheds, Decks, home additions, woodworking projects, and even space ships. You can add Details, textures, and glass to your models, and design with dimensional accuracy. You can place your finished models in Google EARTH, share them with others by posting them to the 3D Warehouse, or print hard copies. Google SketchUp is a great way to discover if 3D modeling is right for you.

Google SketchUp is free for personal use. No registration is required.

For more information, watch a CNET video tour.

Version 6 adds the ability to create a 3D model from ap photo and Sketchy Effects, among other new features.
Features:
Create, modify and share 3D models
Start modeling in SketchUp in less than a day
Use SketchUp to model anything you can imagine
Work in an intuitive way
Create flexible 2D presentations, quickly
Present your SketchUp models with text and graphics
Spend less time on your presentation documents
Print, PDF or Present. Its your choice

Whats New in Google SketchUp 7
Fast and reliable
Weve made SketchUp even more intuitive, added tools for power users, and made it easier to find and share models with the world.

Weve made SketchUp easier to use.
With edges that automatically break other edges where they cross, objects that are smart enough to know how they should behave when you interact with them, and drawing hints that are clearer and more consistent, Google SketchUp 7 is the most intuitive SketchUp ever.

Its all about collaboration and sharing.
In SketchUp 7, you can search for models in the Google 3D Warehouse right from the Component browser, take credit for what you contribute, keep track of your collaborators, and generally BASK in the glow of knowing youre part of the worldwide 3D community. you can free download Google SketchUp 8.0.3117 now.