Althern - that's a cool bit. Reminds me of the scene in TTT when it started raining and Theoden looked up as in 'Oh great - just what we needed now!'
About that Aragorn scene - thinking about it, I get the impression he was reminded of Boromir. And it ties up with the fact that he thinks he'll be meeting Denethor soon, and will have to give him news of his son's death. That alone would explain his troubled look very well...
I got another thing that's not necessarily cool but has been bugging me alright: In Edoras, when Aragorn asks Gandalf: 'No news of Frodo?' and Gandalf responds 'Not a word' - exactly what sort of news were they expecting, and through whom? Telepathic maybe - or a call perhaps??
