From the artcile
Bug Watch: AutoCAD 2006's Menu Overhaul DisasterTool palettes and short-form commands were not included in the CUI's attempts to standardize the AutoCAD customization interface.
I found this very frustrating, since I use tool paletts now. They were very easy to customize before 2006.
I think I'll go back to toolbars, or 2000 if I can find a copy.