J.K. Rowling updated her website today and provided answers to a few frequently asked questions. See her diary, for a glimpse at what the last few months have been like for her. And take a look at the news section for an announcement about an upcoming documentary.
Look below the spoiler space for the questions she answered about Book 7.
Was Dudley's son on Platform 9 3/4 waiting to go to Hogwarts? J.K. Rowling's answer is here.
What exactly happened when Voldemort used the Avada Kedavra curse on Harry in the forest? J.K. Rowling's answer is here.
What exactly was the mutilated baby-like creature Harry saw at King's Cross in Chapter 35 of Hallows? J.K. Rowling's answer is here.
I've been asked all three of these questions many times myself, so I can't imagine how many times she's heard them since the publication of the 7th book.