The good news? DWG Trueview 2009, as the viewer is called, is free (registration form required) and from Autodesk so it's got the same engine used in AutoCAD. It converts to older formats DWG formats to other old and the new 2009 format and includes tools to print, measure, visualize.
The bad news? It's an 193 Mb download.
via Tenlinks Daily