If you haven't already checked it out you really should have a look at
'DrawingSearcher' @ www.docu-point.com - these guys are really moving!
We have been running it for a few weeks now and are very impressed with the
results. We have indexed our entire drawing database (c.20GB) with
DrawingSearcher - using a browser you can then search for text, attributes,
block names etc. contained IN YOUR DWGs and will return hyperlinks to the
drawings containing the information. Click and the drawings open! Use DWF
and 'non-CAD' users can search and view your drawings too. You only need a
Win95 or NT PC!
Take a look - you won't be disappointed. Keep up the good work Docu-Point!