Spoilers below
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Before book 7:

Trust Snape?
Where are all the horcruxes?
Will Hermione and Ron get together?
Will Harry and Ginny end up together?
Will Harry live?
Who will die?
Will Tonks and Lupin get together?
Will Harry go back to school?
Is Harry a horcrux?
What are the Deathly Hallows?
Who was supposed to die but didn’t?
Who died, but was originally going to live?
What will happen to Hogwarts?

After book 7 (but before JRK interviews):

What happened to Hermione’s parents?
Where’s Luna?
What are the Trio and Ginny doing now?
What did Dudley see?
What was Petunia going to say to Harry?

Still:

What is behind the veil?
What is in the Love room?
What happens to the prophecies that were broken?
Who will do magic that hadn’t before?
Did Petunia have anything of Lily’s she could have given to Harry?
What happened to the Dursley’s?