A couple of little theories!

[abergoat]

No: HPFGUIDX 162111

Beci wrote:

> We also know  that if JKR has to tell us anything 
> really important it is said in dialogue by Dumbledore
> or Hermione. Hermione very frequently and very 
> insistently keeps telling us that 'Dumbledore trusts 
> Snape', as does Dumbledore himself. So what I see here 
> is incontrovertible proof that Snape cannot possibly be 
> working for Voldemort, and is therefore not evil. 

Abergoat writes:
I agree with you and Phyllis, JKR has given numerous hints 
that Snape is trustworthy, as horrible as he is. I suspect 
that what Dumbledore chose not to tell Harry was that 
Snape has a reason he entered Voldemort's service...for
revenge against Voldemort himself. Ala 'Et tu, Brute?'
I believe Snape has always been a spy.

As for who 'kills' Voldemort, I'm inclined to go Phyllis's
route. Harry will 'choose' to view the prophecy as meaningless
and will not kill Voldemort even when he has the chance. 
Instead the Dementors will 'accidentally?' take care of the
matter.  Might be nice if Voldemort's soul is so poisonous
that his soul kills off the dementors...

Montims, interesting thought that Voldemort may have so little
soul left that they cannot detect him.  But I've been curious
why the dementors are so attracted to Harry...

Abergoat