Marc (et al),
There is a new community web site at:
http://advogato.org/
A goal is to find common ground between projects.
The easy way for many projects has been to
use a not-really-a-RDBMS-engine.
It would be a good thing for pgsql-core to get
involved to get more support for our engine
in various free software projects.
regards,
Göran