When you're the sort of sad person who pores over publisher catalogues you sometimes spot interesting changes in cover design between the original announcement and the final book. Sometimes they're improvements; sometimes not. Either way, the original designs disappear from the web and are never seen again. This is a shame when they were good.
Two examples from Penguin are shown here. The first is the rejigging of the cover to Eileen Chang's Lust, Caution (Chang's work having been discussed earlier here and here).
Presumably the idea was to capitalise on Ang Lee's movie with a still from the film on the cover. Though the image itself is fine, and avoids the usual movie tie-in cover pitfalls (ie hideous ugliness and instant datedness), I can't help feeling that the original was more beautiful and eye-catching.
The second example is Robert Penn Warren's All the King's Men.
Part of the reason for this must have been to update the book to fit the new Modern Classics look. The first image was from the classic 1949 movie. The second, very wisely, is not from the widely panned 2006 remake. The new cover is more dynamic, and probably better, though the simplicity of the original image of John Ireland has a certain appeal.
Which versions of these books would you be more likely to pick up?
UPDATE: The original Lust, Caution cover features Anna May Wong--see this post for more.