This essay by Regina Doman is easily the most touching and beautiful commentary I've seen on Book 7 of Harry Potter.
By the way, I have started re-reading the series and am getting a lot more out of it this second time through. I'm about 3/4 of the way through the first book. I expect it will take me awhile to get through all 7 this time, but it's kind of nice to savor it.
Some of our descriptions really struck me this time around. The scene where Harry first visits Diagon Alley is a lot of fun - he wishes he had eight pairs of eyes to look at everything. I love it!