Here are a dozen of the most popular current young adult vampire series (listed alphabetically, not ranked):
Blood Coven by Mari Mancusi
Blue Bloods by Melissa De La Cruz
The Chronicles of Vladimir Tod by Heather Brewer
Evernight by Claudia Gray
House of Night by P.C. and Kristen Cast
The Immortals by Alyson Noel
Morganville Vampires by Rachel Caine
Night World by L.J. Smith
The Twilight Saga by Stephenie Meyer
Vampire Academy by Richelle Mead
The Vampire Diaries by L.J. Smith
Vampire Kisses by Ellen Schreiber