www.TheServerSide.com - the J2EE portal
there is an article "Design Patterns and Architecture behind TheServerSide"
which explains how they built the portal and what problems they encountered
(incl. Postgres related) - check
http://www.theserverside.com/resources/pdf/tss_architecture.pdf
hth,
Marin
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"...what you brought from your past, is of no use in your present. When
you must choose a new path, do not bring old experiences with you.
Those who strike out afresh, but who attempt to retain a little of the
old life, end up torn apart by their own memories. "