Versioning control in PostgreSQL?

I haven't used PostgreSQL for nearly a year now, and when I was last
using it there was some discussion on versioning control being
introduced as a feature. Basically, for some data, I'd like to keep
track of who changed it, when, and to what. I know I could include
multiple values in the schema, and have a view to pull out the most
recent, but I was wondering if there was something more automatic that
is a feature of PostgreSQL itself. I've looked around the documentation
with no success. Does anybody know if this is possible?

Alex
--
Mail: Alex Page <alex.page@cancer.org.uk>
Real: Systems/Network Assistant, Epidemiology Unit, Oxford
Tel:  01865 302 223 (external) / 223 (internal)
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