From CA Design:
Amethyst DWG-2-PDF is a powerful Windows program that enables you to quickly and easily batch convert drawings to the Adobe Portable Document Format (PDF). Support for all versions of AutoCAD from 2.5 to 2006. Stand-alone utility - AutoCAD is NOT required. Stand-alone utility - Adobe Acrobat is NOT required. Includes a CAD viewer that allows you to view drawings and convert the currently displayed image.