Here are a collection of features which some developers have back-ported from one PostgreSQL version to an earlier one. They are NOT supported -- USE AT YOUR OWN RISK.
The Backportsproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/backports, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.
