DBReplicator support for PostgreSQL has been reasonably well tested, having been used in production environments with medium(500,000 - 6,000,000 records) sized databases, with sync sessions of up to approximately 3,000,000 records.

Tested with Postgres versions 7.3 and 8.2. It should work for anything in between.

Database Driver
org.postgresql.Driver
JDBC Connect String
jdbc:postgresql://<Hostname>:<Port>/<dbname>