The free standalone batch DWG conversion tool DWG TrueConvert is now available for download. DWG True Convert requires no AutoCAD to be present on the system.
Past blog post about this tool and what it does:
DWG TrueView & DWG TrueConvert
Press release of DWG TrueView and DWG TrueConvert
New, Free Autodesk Tools for Viewing and Converting DWG Data Enhance Communication and Collaboration