I think they should try again with Jean M. Auels' "Earth's Children" series.
"The Clan of the Cave Bear" was mediocre at best, in my opinion.
With todays' computers you could really see what it was like to live back then.
If they didn't want to redo "Clan", then they could start off with the next book in the series, "The Valley of the Horses."
The one after that, "The Mammoth Hunters" would be awesome to behold.
Just to be able to see a mammoth hunt in action would make me very happy.
Edit:
I wouldn't mind seeing a Janet Evanovich "Stephanie Plum" book made into a movie. It's a very funny series.
Her Grandma Mazur cracks me up.

If you haven't read any of the "Stephanie Plum" books, I highly recommend that you do.
The first one is entitled "One for the Money".
In it, Stephanie Plum gets a job as a "fugitive apprehension agent" (bounty hunter, if you prefer) working for her cousin Vinny, the blacksheep of the family, who has a bail bond business.
It turns out she's not very good at being an agent and the series is all about her misadventures in trying to bring in bail-jumpers from in and around The 'Burg, which is in New Jersey, and her interactions with her crazy family.
A light read, but a very entertaining one.
