Steve Scott talked about "How to build an Author Platform and make $20.000-$50.000/month from Books & E-books".
The main theme of his interview was the email list, a theme that is common to several authorsthat I've heard at the Summit and elsewhere.
Steve had a blog and started writing books in 2012. At a certain point he decided to write habit books. The "habit" market wasn't saturated at the time, so it allowed him to write short, actionable books about actions he did every day that made a difference in his life. They're focused on one small/micro topic that he covers in depth. He was consistent in his writing, got books out regularly and built a business.