Memcached Session Handler for PHP: Interesting idea.
Map Address Book addresses via Google Maps: Lookup addresses in the Mac OS X address book with Google Maps (via FireFox).
How the Planner Uses Statistics: Details on how exactly PostgreSQL uses to statistics when running queries.
PGCluster 1.3.0: A multi-master clustering and replication solution for PostgreSQL. Version 1.3.0 is designed for PostgreSQL 8.x.
Postgres max_connections and shared_buffers: It still takes a bit of work to tweak PostgreSQL on Mac OS X, but it is doable.