The Mortal Instruments series by Cassandra Clare
Vampire Academy Series by Rachelle Mead
Bloodlines Series by Rachelle Mead
The Werewolves of Mercy Falls by Maggie Stiefvater
I haven't heard of the Mortal Instruments series.
I started reading the Vampire Academy series and only got to I think the second book as that's the last one my school library had.
I've heard of the Bloodlines series, but never got around to reading it.
And isn't Maggie Stiefvater the same one who wrote that book Shiver?