The 1.0 version of iPGStats for Mac was available as a free download on our website. The application lies within Education Tools, more precisely Reference.
From the developer:
iPGStats is a basic iPhone Application running on iPhone and iPod touch. You can browse your PostgreSQL backends, fetch statistics from tables and indices, view current connections and locks, and kill current running queries. Last but not least you can get it from iTunes-AppStore for free.
You may want to check out more software for Mac, such as SGDVLite, which might be related to iPGStats.