December? Not sure.

Note that a nicely formatted and typo-corrected version of The Sequences is currently being prepared for PDF, Kindle, and iBooks.

If we're going to use links to automatically decode spoilered text, it's not clear to me why we can't still use rot13 for the spoilering, and just make it linked rot13.

I voted for 'quaint internet tradition', but I don't think it's all that quaint; it's a very practical Internet tradition.

Before when I was still contemplating whether consciousness had a non-physical component, well before I discovered coherent philosophy or rationalism, I had a similar "soul swap world" idea. It eventually let me discard the idea of a soul, but I still favoured some kind of non-personal consciousness. This idea eventually became that there was a "consciousness field" permeating space which produced the phenomenon, through interaction with our brains through a physical yet unknown mechanism. I thought it some very subtle physical effect we hadn't noticed yet, not really supernatural.

It was progress.

In Ch 45, Harry thinks:

I comprehend your nature, you symbolize Death, through some law of magic you are a shadow that Death casts into the world.

If this is true, it's possible that as long as death exists (for wizards, anyway), it will continue to cast its shadows, and so the dementors can never be all destroyed. Maybe they'll just respawn or something. In fact, maybe when Harry destroyed that one in Ch 45, a dementor respawned back at Azkaban without anyone noticing. Do the guards keep a count of dementors?

That shouldn't be a problem, polyjuce has been shown able to change gender, and to sustain the transformation indefinitely if taken regularly.

Edit: This also explains (and is made more likely by) how harry getting Malfoy pregnant got taken seriously enough to end up in a newspaper.

My reasons for assigning ~0% to some of these:

threaten to destroy Azkaban destroying one of the Dementors

They would lock him away to protect the Dementors who are Britain's most powerful magical weapon in reserve in case of war with another magical nation. (Quoth Dumbledore.)

offer the Wizengamot Voldemort's true identity (Quirrel)

Harry doesn't know that fact, so he can't offer it. Anyway, how would it help to reverse the judgement against Hermione?

using the Time-turner to alter Hermione's testimony to something easily falsifiable

Can't use it to change what's already happened. Hermione has already given her testimony, and Harry didn't even listen so he wouldn't be in a good position to subtly modify it. And the Veritaserum on her is already wearing off, precluding further testimony.

using the Time-turner to smuggle Hermione out under the Cloak

Harry and Hermione can't be both under the Cloak at once. People under the Cloak can still be caught by physically feeling around. The Aurors would stop them (certainly the one who wasn't under the Cloak at the time), and if they didn't, Hermione would be running around the building Cloaked but with no real way out.

ask for a trial by combat

Wizengamot would have to vote to make the trial-by-combat's results binding (otherwise why should it reverse the standing Wizengamot vote to punish Hermione?) Lucius will ask them not to vote so, because Dumbledore would be Harry's champion, and so they won't.

More generally, if Dumbledore could challenge Lucius to a duel every time a vote went against him, he'd have total control of the vote outcomes by virtue of being undefeatable in combat. And we know that's not the case.

have Quirrel make Bella confess to the crime

What would be the explanation presented for why Bella comes forward to confess, without implicating Quirrel? Just "Voldemort ordered me to do this and then Obliviated me"? Everyone would suspect Voldemort also false-memory-charmed Bella into believing she did it. And why would Voldemort sacrifice his most trusted and powerful lieutenant, whom he recently rescued at great risk, and not some smaller pawn? And why would Voldemort execute a plan to murder Draco or to frame Hermione in the first place? And how would Bella have gotten into Hogwarts without the wards detecting it, or Dumbledore's Map? And how could she be recovered enough already (if she appears to testify everyone will see she's not very recovered yet)?

And to begin with you'd have to explain to members of the Wizengamot that Voldemort is still alive and that he broke out Bella from Azkaban. Imagine the panic - no reasoned debate would be possible after that. But without telling them this, how to explain that Bella is turning herself in, and that she has been Obliviated of everything during and after her escape?

Oh, and by inspecting Bella they will notice she does not in fact have her Animagus form again, which will cause Dumbledore to rethink some conclusions... (Edit: she has probably regained her Animagus form on Quirrel's instructions, it would be stupid not to. See below.)

Go to Azkaban and round up a few hundred dementors.

Harry would never use dementors as his army.

Before the Heaven's Feel arc, you mean.