I spend several hours a day in autocad and have been using the program for the past 5 years. I have tried several keyboard and mouse tools in the past but they have never really worked out real well. ZDNet is talking up a new line of products from 3Dconnexion that is supposed to make your productivity in AutoCAD increase significantly. They have a variety of products for other applications as well.
I am going to order one I will get back to you on how I like it. [ZDNet]