Google SketchUP Pro is software that you can use to create 3D models of anythinsg you like.

Most people get rolling with SketchUp in just a few minutes. Dozens of video tutorials, an extensive Help Center and a worldwide user community mean that anyone who wants to make 3D models with SketchUp, can. Redecorate your living room. Design a new piece of furniture. Model your city for Google Earth. 
Create a skatepark for your hometown, then export an animation and share it on YouTube. There’s no limit to what you can create with SketchUp. 
You can build models from scratch, or you can download what you need. People all over the world share what they’ve made on the Google 3D Warehouse. It’s a huge, searchable repository of models.

Google SketchUp Pro 8 is a suite of powerful features and applications for streamlining your professional 3D workflow. 
All the intuitive modeling, visualization and collaboration features of SketchUp 8, plus exporters for a long list of 2D and 3D vector file formats. 
Also, generate tabular reports based on the entities in your models. 
Link your models to multi-page 2D presentation documents, add images, text and graphics, and share your designs as high-resolution prints, digital exports and onscreen slide shows.

Teach components to animate and scale like they do in real life. Add custom attributes that extend your models’ usefulness. Build configurable components that are easy for everyone to use.

Features:

    Edges and Faces: Thats all there is to it
    Push/Pull: Quickly go from 2D to 3D
    Accurate measurements: Work with precision
    Follow Me: Create complex extrusions and lathed forms
    Paint Bucket: Apply colors and textures
    Groups and Components: Build smarter models
    Shadows: Perform shade studies and add realism
    Sections: See inside your models
    Scenes: Save views and create animations
    Look Around and Walk: Explore your creations firsthand
    Dimensions and Labels: Add information to your designs
    The Instructor: Catch on quickly
    Layers and the Outliner: Stay organized
    Google Earth: See your models in context
    Sandbox tools: Work on terrain
    3D Warehouse: Find models of almost anything you need
    Import DXF, DWG and 3DS: Get a headstart on your modeling
    Import images: Paint walls with photos
    Export TIFF, JPEG and PNG
    Export DXF and DWG: 2D line drawings and 3D models
    Export PDF and EPS: 2D vector images
    Export 3DS, OBJ, XSI, FBX, VRML and DAE

more info 
http://sketchup.google.com/