Originally Posted by llasram
I would actually disagree with that claim. Mobipocket uses an entirely formatting-oriented pre-CSS version of HTML with proprietary extensions. LIT uses the markup format specified by the OEBPS 1/1.0.1, which is an XML-ized HTML 4.0 plus CSS 1/2. Most LIT markup uses semantic @classes to identify textual elements like chapter headings, excepts, etc, while all Mobipocket has is pure, lossy formatting. If you have a choice I would definitely recommend going with the LIT version.
But, with respect, none of that affects the actual appearance
of the book; it just makes it somewhat easier for the publisher to achieve a consistent appearance across a range of books. Please correct me if I'm wrong, but I don't believe there's anything in the way of formatting that a LIT book can have, but a MobiPocket book can't.