In response to my post about Using RDB Link to Tag Wall Volume, Julien Benoit has posted a few helpful comments.  He also referred to his post on RFO.

I previously posted about WhiteFeet tools here.  Basically, the Revit Parameter Tools allow you to drive Shared Parameters with object information that is normally concealed from tags, such as Volume.  There is a lot more to the WhiteFeet package than this, but certainly this is easier than having to go out to RDBLink / Access and back again every time…

Check out screencast embedded below.  Thanks Julien!