Lessfeet

SketchUp is a 3D modeling program designed for architects, civil engineers, filmmakers, game developers, and related professions. It also includes features to facilitate the placement of models in Google Earth. It was designed to be more intuitive, flexible, and easier to use than other 3D CAD programs.

I tried it and in a few minutes I was able to create some pretty complex models.

There are some great video tutorials to learn how to use Sketchup.

There is a pro version that cost hundreds of dollars but you can download the free version here.

I have actually been incorrect! There has been a problem with WPA wireless encryption. I was misinformed! There is a problem with the variety of WPA called WPA-TKIP. It still would take great effort and time to crack it if the password was good but to be on the safeside change your settings to WPA2-AES. If your router does not have WPA2 just use WPA-TKIP and a really good password. Get them here!