FWIW, there's a new graphical admin toolkit for Posgres on the
Mac called pgMac.
From the web site:
 What it is.
The pgMac Database Kit is an industrial strength database
product that consists of the award-winning open source
PostgreSQL database, an installer for Mac OS X, and graphical
database administration tools for managing PostgreSQL
databases.
Who it's for.
pgMac is packaged to be easily used by a Mac OS X developer
with little or no database experience. This release is designed to
be used by software developers who need a database at the
core of their product.
http://www.pgmac.com/index.html