GoodReads Best of 2007 List

In today's GoodReads newsletter, I received a list of Goodreads' Most Popular Books of 2007. Says the newsletter, "So why is our list better than any other? Goodreads can tell you what people are reading now, which is very different from what people are buying. "

They don't specify what that means, exactly, but I guess they mean that members of GoodReads are reading or re-reading things that they bought in past years; that they're borrowing from the library; and that (in the case of The Great Gatsby, The Catcher in the Rye, and To Kill a Mockingbird) they've been assigned to read in school.  ** Attention, marketers:  that trio, plus the Harry Potter volumes below, indicates a large demographic of readers under the age of 22 **

Here's their list:

Goodreads 2007 most-read fiction books

Harry Potter and the Deathly Hallows
The Kite Runner
A Thousand Splendid Suns
To Kill a Mockingbird
Harry Potter and the Sorcerer's Stone
The Catcher in the Rye
Middlesex
The Da Vinci Code
Water for Elephants
The Great Gatsby

Influence-check: 

Of the above 10, 6 have been made into films or will definitely be made into films, at least one (Middlesex) is an Oprah Book Club selection, and Water for Elephants was a Stephen King year-end pick by Entertainment Weekly.

Goodreads 2007 most-read nonfiction books

Eat, Pray, Love: One Woman's Search for Everything Across Italy, India and Indonesia
The Glass Castle: A Memoir
Me Talk Pretty One Day
A Heartbreaking Work of Staggering Genius
Running with Scissors: A Memoir
Freakonomics Rev Ed: A Rogue Economist Explores the Hidden Side of Everything
Into the Wild
The Tipping Point: How Little Things Can Make a Big Difference
The Omnivore's Dilemma
The Year of Magical Thinking

Influence-check:  Of the above 10, 2 have been made into films, at least 2 have been featured by Oprah, and David Sedaris has several ongoing national platforms (The New Yorker, Letterman, and NPR).

All in all, a fairly unsurprising list. I am curious to read more about The Omnivore's Dilemma, and how it gained momentum to become such a big hit.  Anyone have any insights or articles to share?