An article in the online PW looks at how book packagers are churning out bestsellers like the Gossip Girl, Sisterhood of the Traveling Pants, the A-List, and the Au Pairs books. The author, a literary agent, says the idea is the same as Hollywood's love of the high concept: "catchy titles, irresistible hooks, references to pop culture." (Full disclosure: I'm not sure high concept movies all have references to pop culture. Snakes on a Plane was a high-concept movie, meaning you could grasp it from the title alone, but it's not about what the snakes wear or consume.)
It's an interesting article that ulitmately tells authors that the great stuff still comes without a formula.
Not that there's anything wrong with that. Or with a great hook. Or a book "that will sell well."