There are a couple of good books out now on PostgreSQL. They should be able to get you started with PostgreSQL. Of course, there is also extensive documentation on the PostgreSQL website, including a programmer's manual (it, alas, does not have any Perl code, but the Pg.pm module very closesly follows the libpq C library).

-- Brett

Go not to the Elves for counsel, for they will say both no and yes