A lot of similar material appears in both the book and in his essays posted online, but there's also some unpublished stuff in the book as well. As to the rati

A lot of similar material appears in both the book and in his essays posted online, but there's also some unpublished stuff in the book as well. As to the ratio, I couldn't say. But as with Hacker Monthly, I find reading a print edition to be a new experience anyway, even if I've read the online text beforehand.