Chp 39 (the Dementor)
I think that Dumbledore and Harry were too quick to conclude that the Dementor could just be used as a distraction. It was Harry's first idea (once he turned cold), and Dumbledore stopped him there. Cold!Harry didn't even spend 5 minutes on the problem - compare with Harry's instructions to Fred & George in the Hold Off on Proposing Solutions MOR chapter. If there's a plot, that seems much too obvious for Quirrell.
Canon!Harry was especially vulnerable to Dementors, which raises the possibility that the Dementor is there to influence Harry's personality, increase Quirrell's hold over him, and shape him into what Quirrell wants him to be. Dumbledore described Harry as having a mind like a Dark Lord but with love which makes him non-evil, Dementors suck out love & happiness. And Dumbledore is supposed to be the one protecting him, so if anything bad happens to him....
ETA: There is now a third thread, so send new comments there.
Since the first thread has exceeded 500 comments, it seems time for a new one, with Eliezer's just-posted Chapter 33 & 34 to kick things off.
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