A Burning Question

And pertinent on a number of levels. Making the Case for iPad E-Book Prices [pdf]

[P]ublishers also say consumers exaggerate the savings and have developed unrealistic expectations about how low the prices of e-books can go. Yes, they say, printing costs may vanish, but a raft of expenses that apply to all books, like overhead, marketing and royalties, are still in effect.

All of which raises the question: Just how much does it actually cost to produce a printed book versus a digital one?