PostgreSQL 8.0.2 is scheduled for release soon; a beta version is already available for testing.

The main change is the replacement of the ARC buffer management algorithm introduced in 8.0 by another algorithm, 2Q, due to potential patent issues. An improvement to the planner when working on newly created tables will also be included.

• Release announcement:
  http://archives.postgresql.org/pgsql-general/2005-03/msg01311.php

8.0.2beta1 RPMs for some platforms are also available; see here for further details.