Is there a peer-to-peer server solution with PG?

I have need to set up a 2nd database server for a client in their new
offices in another state this month.  We will be shutting down the old
offices later this year but we really don't want to have 2-3 days of
downtime while we physically transfer equipment 800 miles.

We should have decent data connections between the two offices starting
next week, but I was wonding if there is a good peer-to-peer option for
PostgreSQL at this time.

As I understand Slony, it is master-slave only.
--
Mike Nolan