For exaple this http://www.postgresql.org/files/documentation/pdf/9.0/postgresql-9.0-US.pdf
 
20.12.2010, 04:05, "Wang, Mary Y" <mary.y.wang@boeing.com>:
Hi All,
  
I'd like to read more case studies on PostGIS.  I know some case studies are listed in http://postgis.refractions.net/ .
Are there more case studies that you can refer me to?
  
Thanks in advance.
 
Mary