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About Nagini, I'm really not at all sure; I'm just thinking that there must be more to this Parseltongue gift than what we've already seen. Dumbledore has stressed the point that the ability was transferred to Harry when the AK curse bounced off him, and that it is Voldemort himself who (by his choices) has "fulfilled the prophecy" of marking Harry as his "equal". Parseltounge seems to be one thing that links them together. (Since book 4 there's also Harry's blood running through LV's veins to consider.)
I'm wondering if Parseltongue won't make it easier for Harry to destroy the Horcruxes. If I were LV, I'd make sure they were secured in a way that no one besides myself would be able to break. Well, until a few years ago, LV thought he was the only Parseltongue. I would have used Parseltongue as the "password" to be able to "enter" the Horcruxes, although he wouldn't destroy them. Now Harry is a Parseltongue as well. The locket in 12 GP would be a great test, IMO, if it's still there. I've got a feeling Mundungus made away with it and gave it to Aberforth.
HBP p 245:
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The exceptions were two men a little ahead of them, standing just outside The Three Broomsticks. One was very tall and thin; spquinting through his rain-washed glasses Harry recognized the barman who worked in the other Hogsmeade pub, the Hog's Head. As Harry, Ron and Hermione drew closer, the barman threw his cloak more tightly around his neck and walked away, leaving the shorter man to fumble with something in his arms. They were barely feet from him when Harry realized who the man was.
"Mundungus!"
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If Harry is confronted with Nagini and tries to control her with Parseltongue, would he then get in touch with Voldemort's soul within the snake, or with Nagini "herself" (Dd's remark seems to indicate that she still might have an independent "self"), or both?
This is a tough one. I wonder if Harry wouldn't have to possess her like LV does. I don't doubt he, too, has that ability, but would he even think of it? I don't know if Parseltongue alone would let him do that. Legilimency, maybe.
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Could Nagini somehow be persuaded to attack the "human" LV? And if she did, what would the outcome of such an attempt be? It seems likely that by drinking her venom or milk LV has made himself immune to that kind of poison(?); but maybe there's some other twist to it? If she turns against him, perhaps he will kill her?
Nagini seems as fond of LV as he is of her. I think she will have to be killed. I pity the fool who kills her, though. What LV feels for her is the closest thing to love he's ever felt, most likely. I cannot imagine his reaction. **shudder**