Another look at The Road at the NY Times by Charles McGrath:
“What’s moving and shocking about McCarthy’s book is that it’s so believable,” Mr. Hillcoat said. “So what we wanted is a kind of heightened realism, as opposed to the ‘Mad Max’ thing, which is all about high concept and spectacle. We’re trying to avoid the clichés of apocalypse and make this more like a natural disaster.” He imagined the characters less as “Mad Max”-ian freaks outfitted in outlandish biker wear, he added, than as homeless people. They wear scavenged, ill-fitting clothing and layers of plastic bags for insulation.
The script for “The Road,” by Joe Penhall, is for the most part extremely faithful to Mr. McCarthy’s story of a father and son traveling alone through this blighted landscape and trying to keep alive the idea of goodness and civilization — the fire, they call it. The script does enlarge and develop in flashback the role of the man’s wife (played by Charlize Theron), who disappears quite early from the novel, choosing suicide rather than what she imagines will be starvation or worse. And of course the script lacks Mr. McCarthy’s heightened, almost biblical narrative style.
Lots of good stuff in the piece, including how Viggo Mortensen stayed in character all day and how they found the kid (an Australian) to play the boy.  Link via FirstShowing.net.