Release Notes: Massive speed-ups have been made to the JOIN engine, new Session_Simple and Session_Standard plugins have been introduced, and the plugin API is ready. New Load Queries allow expression of complex joins. Updates have been made to Psychoo Web Service, Unified Server, and the Accessor class. Oh, and pagination is cake.
Release Notes: New mixin functions for PHP were added. An XML-RPC service for Psychoo and a Services_Unified_Server class for abstracting Web Services were also added. Magic quotes were fixed. More inline documentation was written.