Meldawen wrote:
The actual (and original) order Lewis intended the books to be read in - the order he wrote them in
I'm not sure what order he intended to read them in, but the other order is the order people normally read them in, since it follows the Narnian timeline. I first read them in the order he wrote them in, though, and when my class read and studied them we read them in the Narnian order, which didn't seem to have as smooth transitions.

That could have been just because I wasn't used to it, though.