DWG True View 2009 rocks!
It is a free viewer which in addition contains an updated DWGTrueConvert. It can now not only package the files with or without conversion to a different version file format, it can also fix file errors, and purge them! And it will not even use AutoCAD license while doing it.
Download free from http://usa.autodesk.com/adsk/servlet/index?id=6703438%26siteID=123112
Another time saver is RECOVERALL command
(File->Drawing Utilities->Recover drawings and Xrefs). Handy when you do not have time to clean up the whole dataset