Microspot announced the immediate availability of Microspot DWG Viewer 1.6.5 on Thursday. DWG Viewer lets you open AutoCAD DWG files on your Mac. The updated version adds the ability to open Layouts, mark up drawings, add annotations and save your documents as PDF. The update also includes a Spotlight plug-in so you can search the contents of AutoCAD files. DWG Viewer 1.6.5 is available at the Microspot Web site, and is priced at US$55 on CD, or $49 as an electronic download.