PostgreSQL 8.1 has been released. You can download from here, and the source code from here. The release notes are here.New features include: Improve concurrent access to the shared buffer cache. Allow index scans to use an intermediate in-memory bitmap. Add two-phase commit. Create a new role system that replaces users and groups. Automatically use indexes for MIN() and MAX(). Move /contrib/pg_autovacuum into the main server. Add shared row level locks using SELECT…FOR SHARE. Add dependencies on shared objects, specifically roles. Improve performance for partitioned tables.