So you want to take you multi-colored drawing and plot it in just black and white, but how? This post is a direct result of a question I received from an attendee on the See the Difference with AutoCAD 2010 Tour in October.
In AutoCAD when you go to the Plot command and enter the Plot dialog expand the Plot dialog.
Update 12-14-09: I was unaware that AutoCAD Architecture "ACA" did not contain the basic monochrome CTB plotstyle so I am posting it here on the post. Download Monochrome.
Update 12-15-09: There is a monochrome plot style in ACA just not too obvious. There is AIA Standard.ctb which happens to be monochrome. Thanks Bill and Jeff.