The Road came out in paperback this week. It wasn't supposed to be out until September, but they bumped up the publication date so Random House would sell even more copies, what with the Oprah endorsement and all.
As for Oprah and this book, yeah, it's an intense, gruesome book at times (though nowhere near as much as say Child of God or Blood Meridian or whatnot), but it's arguably McCarthy's most accessible work to date. And in spite of the gloominess of the story, it's filled with hope.
Also, I'm surprised to hear he spoke at your school. What'd he talk about?