Lament: The Faerie Queen's Deception, by Maggie Stiefvater (Flux 2008, 336pp) is a great addition to the sub-genre of fantasy in which human girls find their destinies entwined with non-human types (faeries, vampires, and such like).
Deirdre had no idea, when she met Luke, and began to play music with him, that she was at the beginning of a perilous encounter with the hosts of faerie...Her love for Luke, strange and beautiful (and dangerous?), her growing awareness of her own fey powers, and her realization that she has become involved in a life or death struggle against inhuman beings make for a gripping read.
Just a quick warning--things are not wrapped up neatly at the end (although the worst of the danger seems to be over). So you'll have to wait until the sequel, Ballad, comes out next fall to see what happens to Luke and Deirdre...
Here's another, more detailed, review at The Story Siren.
Lament has been nominated for the Cybils in the Science Fiction/Fantasy category.