We just completed PGDay Austin, and it was a great event. It was a single-track conference in a serene hotel — this gave the event a polish and cohesion that I have rarely felt at Postgres events. Everyone knew where they should be, nothing felt rushed, and the talks were all of high quality. I wouldn't be surprised to see double the attendance at next year's conference.
The most exciting talk for me was Will Leinweber's Schemaless SQL. The talk started by explaining why developers like the document storage model, and Will explained his experienced moving from document storage databases to Postgres. Will found our hstore extension to be ideal for storing the type of unstructured data he used to store in document databases. Hstore gave him the best of both relational and document database worlds.