I am very excited to learn that Harry Potter and the Deathly Hallows will be released in two parts. This is excellent news. The big difference about Deathly Hallows from the other books is it that virtually everything is essential to the plot of the books. No little subplots that you can easily take out or work around.
For me it means extending the magic of Harry Potter a little longer, and having another three movies to look forward to until Summer 2011. That is a very good thing, in my opinion, and i disagree with all the cynics who say WB are only doing it for the money. I am hoping that, with 2 movies to work with, they will really do an excellent job and do a great justice to the entire series.
The rest of this post is full of spoilers; my speculation of where they might split the two parts.