Create 3D models with Google's sketchup

Create 3D models at ease with Google's sketchup service. You can make
sketches of office buildings, houses, etc and the best part is, it is
free for personal use. Those building your dream house, try your hand at
this software. Its gonna be helpful to visualize your plans.

Checkout the flash presentation in the below page
http://sketchup.google.com/products.html