This presentation explains how OpenSource software can live for a very long time, and covers the differences between proprietary and open source software life cycles. It also covers the increased adoption of open source, and many of the ways that Postgres is innovating to continue to be relevant.
The Democratization of Databases - Bruce Momjian
PostgreSQL High-Performance Tuning and Optimization
Understanding and Optimizing commit sychronization for maximum performance
Migrating from MSSQL to PostgreSQL
An introduction to pgcrypto
Joining Heterogeneous Databases is a reality, not a Myth