i think this is interesting news from autocad creators autodesk. they appear to be making some moves to bring OS X into the fold, including allowing "Mac users to view and print design information created by Autodesk design software" and saved in the DWF 6 format. not quite sure what this means and it's a long way from announcing AutoCAD for OS X, but still potentially a move in the right direction. and, i suspect, an opportunity for 3rd parties and file conversion tools.