"Harry Potter and the Half-Blood Prince" was a hard book to get through. It was a fast read, it was a good read - but, like book five, there were moments when it was hard to deal with where the characters were heading. I now understand why Glenn Reynolds said that his son was depressed after finishing the book - there's good reason to be.
I'm not going to include any spoilers here - too many people are waiting in line to read the book. I highly recommend it, and - like so many other people - I'm now breathlessly awaiting the finale.