A project to define a replication API for the PostgreSQL back end, to accommodate the various kinds of replication that people seem to want.
The Pg replication hooksproject is a PostgreSQL Community project that is a part of the pgFoundry.
The pgFoundry page for the project is at http://pgfoundry.org/projects/replica-hooks, where you can find downloads, documentation, bug reports, mailing lists, and a whole lot more.