Note: Does not work on Windows 8

Continuously innovating for 20 releases, AutoCAD- 2006 software increases
efficiency with across-the-board improvements to bring productivity up and
lag time down. Between the big idea and its realization, day-to-day tasks
are crucial to implementation, and with productivity enhancements for the
tasks you do day in and day out, AutoCAD 2006 makes efficiency a part of
your everyday toolbox.

http://usa.autodesk.com/adsk/servlet/index?siteID=123112&id=2704278