The Futon Critic had the following information on casting for the Vampire Diaries:

THE VAMPIRE DIARIES (The CW)

Paul Wesley (“Everwood”) has been tapped as the male lead of the drama pilot, about Elena (Nina Dobrev), a tragic heroine who is the object of passion for two vampire brothers. He’ll play Stefan, a “gloriously, amazingly, epically beautiful young man who is actually a 200-year-old vampire who has a strong connection with Elena.” Also signing on are Michael Trevino, Katerina Graham, Sarah Carey and Candice Accola. Carey will play Jenna, Elena and Jeremy’s (Steven R. McQueen) aunt, with Graham and Accola as her best friends, Bonnie, an amateur psychic, and Caroline, the queen bee at their school, respectively. Rounding out the bunch is Trevino as Tyler, a cocky jock who butts heads with Stefan. Julie Plec and Kevin Williamson are behind the Warner Bros. Television-based hour, which Marcos Siega is directing