It's not even November yet, and already we're seeing "Best Books of 2009" lists. Amazon's includes a few YA so far:
64. Lowboy by John Wray (I have this in the library but I haven't read it yet. It's going on my TBR pile on Monday.)
62. Shiver by Maggie Stiefvater (which I also quite liked)
42. Catching Fire by Suzanne Collins (loved it)
PW's list (which notably has no female Top 10 authors) includes David Small's Stitches. I haven't read it, but only one of my students has checked it out, and she said it was "good but sad." There just hasn't been much interest in this book, although I might be able to drum up a little more if I let them know it's a true story.