Sun submitted results of the SpecJAppserver benchmark running on Glassfish and Postgres.
Josh Berkus discusses the results at his blog: http://blogs.ittoolbox.com/database/soup/archives/postgresql-publishes-first-real-benchmark-17470.
The benchmark results can be found here.
Congratulations to the whole team that made this possible. It is a big sign that Postgres is in fact fast (other than what urban legends are always trying to tell).
Of course no one has that configuration 'at home' and I would recommend JBossAS anyway :), but anyway ... :-)