Impossible Astronaut and Day of the Moon should have been shown together. As a whole I liked them, but was initially disappointed with the cluster mess that was the Impossible Astronaut, however- it totally paid off in Day of the Moon. Those two episodes are inseparable, and I don't think they work as stand alones. Of course, many of the original episodes were that way too.
That last ending was fantastic! No clue who that girl is, but the season is off to a great start. Bring on the Pirates!