Hello everyone.
There were a number of people asking about ERD tools here a while ago,
so I decided to publish one that I've put together.
It's called Autograph, and you can find it on the pg foundry:
http://pgfoundry.org/projects/autograph/
Autograph is really just an XSL stylesheet, used in combination with
graphviz, xsltproc, convert and the downloadXml.py program from Scott
Kirkwood's xmltoddl package.
The documentation page, including a couple of example diagrams, is here:
http://pgfoundry.org/docman/view.php/1000360/4848/readme.html
Enjoy!
Regards,
cf