PGCon 2012 is now over. Surprisingly, all the talks that excited me were from the second/last day. My morning started with WAL Internals Of PostgreSQL (slides) by Amit Kapila. I rarely see this topic covered, and his comparisons to Oracle's transaction logging were fresh. Also in the morning, Hooks in PostgreSQL by Guillaume Lelarge: I also rarely see this covered. It highlighted the C-language plug-in capabilities of Postgres.
My afternoon highlight was Big Bad "Upgraded" PostgreSQL by Robert Treat. After the occasional maligning of pg_upgrade (often in jest), it was great to hear a big pg_upgrade success story. (This OmniTI blog entry has the details. This talk was also presented at PG Corridor Days DC.)