Eternal (Candlewick, 2009) by Cynthia Leitich Smith is not your average vampire story. In fact, much of the story is told from the viewpoint of a guardian angel. It's a story of mistakes, enthrallment, betrayal, and redemption. Watch the book trailer at Cynthia's site.
Eternal is a companion book to Cynthia Leitich Smith's Tantalize. She's working on Blessed, due out in 2011, where characters from both books will appear.