For a beginning book, I would recommend 'Beginning Databases with PostgreSQL' by Richard Stones and Neil Matthew. It's a well-rounded book that doesn't assume you know a lot. Before you buy a book, I would look at the free books online. See:
> What would you guys recommend as a good > introductory book for PG? One that talks > about and goes into the features, use and > administration of PG and not necessarily > just SQL?