Just how big is the ebook marketplace? Listen all the way to our top story to find out the latest estimate. After thanking their patrons, Star Flame, Merkiaari Wars, and Awakened, Jim and Bryan talked tips on engaging with audio, staying sticky in the rankings, and nonfiction book length. News stories included Amazon's six-month KU deal, engaging with your fanbase, newsletter subscribers from giveaways, going fast vs. slow as a writer, and the size of the ebook marketplace. This week's Question of the Week: Do you believe Michael Cader's estimates of the size of the ebook marketplace? Are they too high, too low, or just right, and why?