If you're a Miller I am punching Denmark in the face.

People who need to be looked at closely tomorrow:

Albus Dumbledore
Dobby
Luna Lovegood

I know Voldemort is innocent (barring some ridiculous mafia role or a replacement Godfather). We can also be fairly sure that Filch is also innocent, considering 3/4 of Snape's list was correct. And I think Myrtle's just playing stupidly.

My observations: Luna and Dumbledore seem to be the most eager to keep the spotlight on Myrtle, siding with someone else only reluctantly. Dobby seems to try to be the most reasonable and not starting anything, only going along with others (perhaps trying to avoid suspicion).

I was thinking Dobby earlier, but Dumbledore today made me more suspicious. So take from all that what you will.