The January giveaway at the Tantalize Fans Unite! group at MySpace is two copies of Prom Dates from Hell by Rosemary Clement-Moore (Random House, 2007)(excerpt).
From the promotional copy: "Maggie Quinn knew high school was hell, but even she thinks the smell of brimstone was a little out of the ordinary. When she's the only one to see that something supernatural is stalking the school's ruling clique, it's up to Maggie to channel her inner Nancy Drew and ferret out the origin of the ancient evil, before all Hell breaks loose at the Senior Prom."
The companion book, Hell Week, will be published in August 2008.