The 2009 William C. Morris Debut YA Author finalists are:

Ash, by Malinda Lo

Beautiful Creatures, by Kami Garcia and Margaret Stohl

The Everafter, by Amy Huntley

Flash Burnout, by L. K. Madigan

Hold Still, by Nina LaCour

I've read a whopping... none of them.  Yeesh.  Man, my reading has been so very down this year.

More info at the ALA's WCMDYAA page.