My thoughts on the book and the lead-up to Harry's penultimate* confrontation with Voldemort are here: http://malabud.livejournal.com/30713.html.

Also I think the daily_snitch and hogwarts_today are collecting links of meta and reaction posts.

Have fun!

* I don't want to give too much away just in case people who haven't read the book click on this entry. You know which event I mean, I'm sure.