High Availability solution

Hi,
I'm involved in developing a web-site using JBoss, Hibernate, and
PostgreSQL. We are trying to find a good replication solution that will
give us high availability without a single point of failure.

We have been looking at Sequoia but their product doesn't seem very
mature. What we need must be well proven and stable.

We do mostly reading but our application is currently not designed to
redirect all write activities to one single node. So unless there is a
driver in between that does this, we will not be able to use a
single-master solution (at least that's the way I've understood it).

What kind of solution would be the best for us? What are others using
for their JEE server backends?

Kind Regards,
Thomas Hallgren