PG Admin Version 1.6.0 (Nov 15 2006, rev 5641) Running on Windows 2000
PostgreSQL 8.2.6, running remotely on Linux

pg_hba.conf contains the record ...
host all all 12.345.678.90 255.255.255.255 trust
where 12.345.678.90 is the IP address that I am trying to connect from

Database started with
/usr/local/pgsql/bin/pg_ctl -D /usr/local/pgsql/data -o -i start
...