In addition, replication is the next thing where PostgreSQL is vastly improving (according to their road map). Also note that if you want to trade some of the

In addition, replication is the next thing where PostgreSQL is vastly improving (according to their road map). Also note that if you want to trade some of the ACID properties for better performance and replication, the so-called NoSQL databases (CouchDB etc) seem to be a better trade-off than, say, MySQL with MyISAM instead of InnoDB.