Not a bad episode, as such things go, but i'm still not sure about this version of the Doctor.
I have a problem with the Doctor not knowing at least a *little* about Earth, since he has the memories of all his previous incarnations.
Also, he's just a touch too "eccentric" - plain raving crackers is more the way i'd put it.
That said, i did like Amy's part, small though it was - rather more proactive than a lot of other companions, if still a touch screamy. Of course, i might be screamy in the same situation - actually, i'm fairly sure that i *would* be.
Like the not-quite-the-end episodes of previous series ("Blink" and "Turn Left", for instance) it did feel as if Amy's part was deliberately kept fairly small to free her up to work on the upcoming series-ending two-parter.
In fact, i felt as if one particular aspect of this story echoed "Blink" a bit, one of several resonance with past episodes that i felt (rightly or wrongly) - particularly with "The Eleventh Hour", though it turned out that that was all in my mind.
Enjoyable, but not, i think, one of the real high points of the program's history...