For book recommendations sourced from HN itself there's https://hackernewsbooks.com https://hackernewsbooks.com We aggregate the top books found in comments an

For book recommendations sourced from HN itself there's https://hackernewsbooks.com https://hackernewsbooks.com We aggregate the top books found in comments and rank them based on how often they are mentioned and the karma of the user. There's a weekly newsletter sent out with that week's book selections.