Enlarge By Rob Schumacher for USA TODAY Twilight cast a warm glow for author Stephenie Meyer. But the queen of 2009 book sales also had the top movie tie-in titles, too.

For the second year in a row, Meyer swept the top four spots. No other author — not even J. K. Rowling— has done that in the list's 16-year history.

Meyer's coattails pulled 16 other vampire titles onto the list of the year's 100 most popular books.

"Meyer had an unbelievable impact," says Michael Norris, books analyst for Simba Information, a market-research firm. He wonders what publishers will do when what he calls " 'the vampire industrial average' falls. Every cycle has an end."

But for now, Meyer — who has also benefited from Twilight movie adaptations, with more to come — has turned "the YA (young adult) category into the PG-13 of books," he says. "She's not just read by tweens and teens, but by a lot of 30-year-old women."

No matter who's reading them, books for kids and teens accounted for 29% of sales tracked in 2009 — the highest percentage in the list's history, up from 28% in 2008 and 22% in 2007.