From PostgreSQL wiki
Tungsten Enterprise includes components that offers data availability, data protection, scalability, easy cluster management and advanced monitoring of PostgreSQL, MySQL, and Oracle databases. These components include a Replicator module that supports PostgreSQL, a variety of high-availability proxy implementations, and associated management tools. See Tungsten FAQ for a brief introduction to the product and its components.
Tungsten Replicator for PostgreSQL is a proprietary product that's in beta testing by early adopter customers. It currently supports warm standby as its replication mechanism, with Londiste-based replication under development.