Architectural Desktop 2005
 

Autodesk Architectural Desktop 2005 is an amazing 3-dimensional drafting
package. For a long time, the third dimension presented a big challenge
in drafting, and early 3D software was very cumbersome and time consuming.
Autodesk has been a leader in the conquest of the third dimension; I now
can honestly say that 3D work as easy and even more efficient then
traditional drafting methods.

URL:
http://www.bytesector.com/data/bs-article.asp?ID=386

To use it is not difficult; To master it is another story.:)