Cod's DuMaurier thread is reminding me how much better Rebecca is than either of the 2 sequels (there's a Susan Hill one and one by some feminist writer called The First Mrs DeWinter or something like that).
Which reminded me of the utter, drivelling can of tripe that is 'Scarlett - the official sequel to Gone With the Wind' (Scarlett goes to Ireland and gets all Celtic and New Age).
Never read any of the Jane Austen ones.
Can anyone think of any others?