I’m currently at Michael Swan’s talk about his new edition of “practical english usage”, a book everyone of us knows. He added some new interesting things to the fourth edition, like differences between american and british english. Moreover each chapter now has an introductory section, which is quite helpful I think.
I really like the book because it’s always a good resource to look grammar up if you’re unsure.
He also told us about the publishing process and how complicated it was to get the book online.