Creepy high school girl in the attic?

So most of my blogging time is spent on the work blog The Wild Rumpus but I came back here fully intending to post about my most recent YA reading. I just finished Madapple by Christina Meldrum and Bliss by Lauren Myracle. Of course I just spend a good chunk of time deleting spam from the comments and now this piece of crap computer I have seems to have slowed to a crawl. Argh. Anyway, since I finished Bliss I've been thinking about all the "possessed" teenage girl books I've read the past year and how in some ways possessed girls are the new "mad woman in the attic" of YA . Sort of just starting to ponder this. I don't really have any concrete thoughts as of now. If anyone has any thoughts on the topic, let me know.