Warning: a few vague spoilers in the write-up.
Mr. King is not too happy with most reviews of book 7:
...very few mainstream writers, from Salon to The New York Times, have really stopped to consider what Ms. Rowling has wrought, where it came from, or what it may mean for the future. The blogs, by and large, haven't been much better. They seem to care about who lives, who dies, and who's tattling. Beyond that, it's all pretty much duh.
In the process of outlining his love for the series, we learn why Rowling is a master writer and get a peak into the brilliance that is Stephen King.
A great read and a better bookend for the Harry Potter series.