Based on recent discussions with other developers, I'd largely agree with Percona's take. Postgres is becoming the default OS database for applications and SQLite is starting to colonise the MySQL space where speed and simplicity are sought over some of the more advanced RDBMS. It's nice to see several companies providing professional Postgres support and contributing actively to its development.
Worth noting, that though I'm no fan of Oracle, they have definitly improved the quality of MySQL since they bought it.
Biting the hand that feeds IT
