Hi,
I have added db.out.ogr to GRASS 6.3-CVS. It exports
into various formats, e.g. CSV, DBF, PostgreSQL etc.
You can grab it from CVS, the next Saturday's snapshot or
directly from here:
http://freegis.org/cgi-bin/viewcvs.cgi/grass6/scripts/db.out.ogr/
Enjoy
Markus