For a limited time you can download a fully functional time limited trial from the DWG Columns page. You can use it until 30-SEP-2012. After that it will work as a freeware but only showing the DWG version column.
Existing customers will be emailed a link to the fully functional version.
Use DWGPROPS to edit the drawing properties with AutoCAD and automate it using Propulate tutorial for DWG properties. Properties supported are from the Summary tab: Title, Subject, Author, Comments, Hyperlink base and from the Custom tab the first 10 custom properties in the list.
To see properties in an infotip (tooltip) see DwgInfoTip.