DWG TrueView™ is now available for free from Autodesk.
http://www.autodesk.com/dwgtrueview
Spread the word! You can view DWG files 100% just like AutoCAD can for free.
"Share AutoCAD® drawings easily and accurately among engineers and architects with DWG TrueView™. View and plot DWG and DXF™ files, and then publish them as DWF™ files for quick and easy review and markup in Autodesk® DWF™ Composer. And you’ll always get full drawing fidelity because the DWG viewer is built on the same viewing technology as AutoCAD® 2006 software."