check this
http://symmetricds.codehaus.org/
I just began playing with that one
> Date: Thu, 19 Nov 2009 12:39:04 -0600
> From: Kevin.Grittner@wicourts.gov
> To: pthiyagarajan@cashedge.com; pgsql-admin@postgresql.org
> Subject: Re: [ADMIN] Replication solution
>
> Palaniappan Thiyagarajan <pthiyagarajan@cashedge.com> wrote:
>
> > I am looking for Postgres replication solution for 8.3.x DB.
> >
> > Any open source software available for replication?
> >
> > Anybody has good step by step doc for warm standby setup?
> >
> > Any other suggestion to achieve replication is appreciated.
>
> You might want to start with these pages:
>
> http://wiki.postgresql.org/wiki/Replication%2C_Clustering%2C_and_Connection_Pooling
>
> http://www.postgresql.org/docs/8.3/interactive/warm-standby.html
>
> -Kevin
>
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