I enoyed reading Alan Jacobs' take on Harry Potter and the Half-Blood Prince, which follows a similar vein to the Vulgar and Dreadful article Gaines' mentioned below. It gives away plot points, so don't peek if you haven't read book 7.
Jacobs is an English professor at Wheaton College, and I often wish I could take one of his classes, especially this one. I subscribe to Jacobs' tumblelog, and will be glad when it returns in September from European vacation. The bits and pieces he posts always give me pause and often inspire blog posts (some of which I never get around to finishing, but at least it gets me thinking!).