Brief musing about Dumbledore
So, does anyone else think that Dumbledore wanted Harry to keep the quest a secret from everyone except Ron and Hermione because Harry was supposed to let Voldemort kill him at the end of the quest? And by that I mean that had everything gone as Dumbledore planned, Snape was supposed to find Harry and explain the whole "Surprise! You're a horcrux." thing to him. Let's assume that Snape getting munched on by Nagini was not part of the plan. Now, if Harry had adult supervision (or even a bigger group of kids with him)on his quest, it would have been much harder for Snape to get to Harry alone, and for Harry to march bravely to his death. I'm sure it could have been done, but it would have been a lot harder.
Anyway, that's what I think.