Stephen King's upcoming novel UNDER THE DOME is a reworking of a manuscript called THE CANNIBALS that he wrote and abandoned in 1989 which, itself, was a rethink of a novel he abandoned in the late 1970s. King is sharing the first sixty, original, typed pages...with his handwritten changes…of that 1989 manuscript on his website and it's a fascinating peek into how he works.
(Thanks to Duane Swierczynski for the link)