I read all the books as a kid and loved them. I think the Silver Chair was the first book in the series that I read, only because it was a gift.
My wife is eager to read the books because she didn't read them as a kid, but LOVED the movie (hear that, BobJ?).
So for someone who hasn't read the books, in what order should they be read for maximum enjoyment?
But, if I were going to read them, I would read them in the original order as written and published over a period of about 10 years:
LWW
Prince Caspian
The Voyage of the Dawn Treader
The Silver Chair
The Horse and His Boy
The Magician's Nephew
The Last Battle
It actually makes sense in a way. All the books dealing with the modern (at that time) English children come first, first the Pevensie children and then Eustace and then Jill. Then the Horse story - which is told as a tale that happened long ago (and is mentioned by the way in The Silver Chair as a ballad sung by a minstrel at a feast -- Lewis I'm sure got to ruminating on it (his day job dealt in part with the jongleurs and troubadours) and took it from there.) The last two stories are mirror images of one another - the Creation and the End of Narnia - and have a good deal more frank Christian themes and imagery in them than the others.
The order as originally written makes more sense to me for those reasons.