I wasn't surprised that Dumbledore died. In fact, I'd been expecting it for several months, so I was glad when it happened, so I could rub it in the faces of my non-believing friends! To be honest, though, I'm not quite sure what the whole Half-Blood Prince thing had to do with anything else related to the plot, or maybe I've already forgotten the connection...
By the way, Sessler, you beat me to the punch again because I'd been planning to start a thread like this!!!