Based on the books My Life in France by Julia Child and Julie and Julia by Julie Powell, the film version Julie & Julia has helped boost book sales of all three titles from year-over-year.

With millions of copies sold, the Harry Potter book series does more than magically fly off the shelves, it has also been a force at the box office, on television, on the web, and even at the record stores. Similarly, a recent book series and film franchise, Twilight, has shown an ability to not only sell books, but also have an impact on the big screen and iPods as its brooding soundtrack has outsold the movie scores of the young wizard head to head. And while web buzz on Harry …