To materialize and test for in-place upgrade facility per my recent proposal on pgsql-hackers and here: http://archives.postgresql.org/pgsql-hackers/2003-12/msg00379.php
The pg_upgrade: in-place upgrade facilityproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/pgupgrade, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.
