Mirroring PostgreSQL database

Hi,
I have one customer who is using PostgreSQL 7.4.8 on Linux . He has some
problems with database mirroring . The details are follows.
The customer is using Linux on which PostgreSQL 7.4.8 along with Jboss
3.2.3 is running . He has 2 servers , one is acting as a live server
(primary) and another is acting as a fail-over (secondary) server .
Secondary server is placed in remote location . These servers are acting
as a Attendence server for daily activities . Nearly 50,000 employees
depend on the live server .

The customer is using DBmirror tool to mirror the database records of
primary to secondary . The customer is complaining that there is one day
(24 hours) delay between primary and secondray for database
synchronization . They have dedicated line and bandwidth , but still the
problems exists.

I just want to know , for immediate data mirroring , what is the best
way for PostgreSQL . PostgreSQL is offering many mirror tools , but
which one is the best ?. Is there any other way to accomplish the task ?

Thank you . Waiting for your reply.

Thanks & Regards,
Shashi Kanth
Consultant - Linux
RHCE , LPIC-2
Onward Novell - Bangalore
9886455567