I finished The House Next Door and I'm on to The Ruins by Scott Smith. I hear this one has talking plants! Woohoo!
The House Next Door is not a traditional scary book, but there were a few more of those ohmygoodness moments. If you're worried about goriness, there's one part that made me cringe a little, but nothing on the level of Stephen King or Dean Koontz.
(A little aside here: If you're wondering what it would be like to rip someones testicles completely off their body, Stephen King offers a great description in Black House. Just in case you're interested.)
The ending was a little disappointing, but only because I like to end books with the plot neatly tied up in a little bundle with no annoying loose strings poking out.
All in all, it was very well written with believable, well-developed characters. I'm on the hunt for more books by Anne Rivers Siddons.