PostGIS in Action (2nd)
Where the adventure begins

We are working on second edition of PostGIS in Action 2ed for availability sometime in mid 2014. Early purchase review (MEAP) is now available for Second Edition: 15 of 17 chapters now available on MEAP with code and data download on PostGIS In Action Edition 2 Chapters. With MEAP you can get chapter updates as we write them and get the final polished copy at release time in both E-Book and Hard-copy form. Each purchase includes all E-Book versions including E-book version of 1st edition.

Our most recent book PostgreSQL: Up and Running is out in both E-book and hard-copy. You can order hard-copy now from Amazon or Kindle or hard-copy or e-Book from O'Reilly. We are hard at work on the second edition of PostgreSQL: Up and Running as well. Should be out mid 2014 and with focus on PostgreSQL 9.2-9.3.

PostGIS in Action: PostGIS Case Studies

PostGIS is used by organizations large and small and has garnered a lot of commercial support. Its ease of use, unmatched performance, feature set, scalability, ease of deployment, and ability to integrate in most any environment makes it a no-brainer solution for most GIS work involving high end analytics and integration with other business processes.

These are sites using PostGIS that are publically accessible

Below we have a list of links to case studies on how it's currently used.

   Buy PostGIS in Action direct from Manning and qualify for volume discounts    PostGIS Cookbook    PostGIS 2 Análisis Espacial Avanzado (Spanish Edition)
Direct from O'Reilly
PostgreSQL: Up and Running   Learning SQL    Learning R