Ok, I could have sworn I had posted on here before...but apparently I haven't

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Anyway...Legolas- I loved him! I thought he looked a hell of a lot better than Haldir with that wig, in any case (not that that was hard...) *ducks from Haldir fans*. He seemed a bit like a person of only about two facial expressions, but there you go...I certainly can't imagine anyone else in the role.

Also, I never succeeded imagining him at all from reading the books...so Orlando fits the bill just fine

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Éowyn- I loved her in the movie, she really brought the character to life in a way that I had never appreciated from reading the books. I did have a grudge against one of the aspects of her character though, but it has been so long I can't remember what it was! Something to do with her not despairing enough or something.
Treebeard- I retain my original vision of Treebeard. The film one...well, to be honest, I never really imagined it having
legs as such, only feet. I kind of envisioned him walking in a way where you would never quite see his legs moving, as though they were surrounded by mist. I'm sorry, that was a terrible explanation! But yeah...more like the Huorns than the way Treebeard walked around in the film.
Aragorn bugged me a bit too. I thought Aragorn was more noble than arrogant in the book though...but I suppose there can be a fine line between the two. I certainly don't know where they got the idea of him being a reluctant hero from though. I prefer my vision of him from the book.