Need a 3D home design program for free. Any out there?

Question by Bill C: Need a 3D home design program for free. Any out there?
I’m going to do an addition to the home. I was looking for a 3D home design program that is either web-based or a free download. First one to answer with a link I like gets 10 points!

Best answer:

Answer by rheins2000
Google Sketch-up is free and I designed everything in my house with Sketch-Up. The free google version has most of the features that the regular sketch up has (and its 0 cheaper)

Its the best 3-D program out there (the extrusion commands are amazing)

Know better? Leave your own answer in the comments!