Funny you should say that, Steve. I was contacted by a literary agent from a major publishing house last week to do exactly that. He specializes in working in developing an article into a book. One of his last authors was Siddhartha Mukherjee, who wrote The Emperor of All Maladies: A Biography of Cancer.
Amazing book, strongly recommended.
It won the Pulitzer Prize, so he must know what he's doing.
