The code assumes little-endian throughout and was written with the intention of never being ported to big-endian. Every integer that is sent over the network would have to be byte swapped, in addition to many dozens of other places in code. It would not be worth the extra sourcecode bloat.
Big-endian is on its way out anyway.
BitcoinTalk
#8From:
satoshi
Subject:
Re: Big endian code problems
Date: