A great list of fascinating back stories behind some famous (and some, not-so-famous) works of literature.
I would add John Milton to that list, dictating his masterpiece, Paradise Lost, entirely orally, because of his blindness (well, and every work of his thereafter - Paradise Regained, Samson Agonistes, etc). Even by themselves, without the knowledge of how they were written, those Milton works are incredible -- packed full of allusions and references to mythology, the Bible, etc. I can't even begin to imagine dictating my own novels to someone out loud, much less works injected with those sorts of references.
Any other works you can think of?