Software
PostgreSQL.org
PostgresSQL is the web site run and maintained by the core postgres development team. You can always get the latest version of Postgres,
source or binary, via PostgreSQL.org.
Source code is a compressed tar bal and is available at http://www.postgresql.org/ftp/source/v8.3.1/.
Binaries are available for Solaris, Linux and Windows at http://www.postgresql.org/ftp/binary/v8.3.1/.
EnterpriseDB.com
EnterpriseDB, my employer, is the postgres company that is turning Postgres into an enterprise acceptable database. EnterpriseDB, in
additioning to offering software, also offers support subscriptions, training and professional services.
The softwate offered by EnterpriseDB comes in two flavors: Postgres Plus (open source) and Postgres Plus Advanced Server (closed
source). The differences in the distributions are discussed in Postgres Database Distributions.
You can download binaries and source code for Postgres Plus and binaries for binaries for Postgres Plus Advanced Server at http://www.enterprisedb.com/products/download.do.
Support & Documentation
PostgreSQL.org offers the latest documentation at http://www.postgresql.org/docs/.
EnterpriseDB offers the latest documentation for their Postgres Plus family at http://www.enterprisedb.com/learning/documentation.do.
Forums
EnterpriseDB hosts the Postgres Plus forums at http://forums.enterprisedb.com. They offer
separate forums for the open source and closed source products.
ITToolbox.com, the site where I blog, also contains many groups that cover both Postgres and EnterpriseDB. You can access the Postgres
group at http://db.ittoolbox.com/groups/technical-functional/postgresql-l.
You can access the EnterpriseDB group at http://db.ittoolbox.com/groups/technical-functional/enterprisedb-l.
Blogs
I find blogs to be the best source of general reading about a database. Concepts manuals are good for getting started and forums are
good for asking questions but blogs cover what people are thinking.
My blog, An Expert's Guide to Oracle Technology, is at http://blogs.ittoolbox.com/oracle/guide. I primarily cover Oracle topics but I am known to
write quite a bit about Postgres and EnterpriseDB as well as cover other technologies.
A current list of recommended blogs is available on the Reference Information page.