Stanza is currently the number one ebook app for the iPhone, and chief operating officer Neelan Choksi shared some other impressive stats with me. In its first six weeks, Stanza was downloaded 200,000 times — compare that to Amazon’s Kindle, which is seen as building momentum because it sells 40,000 units per month. Okay, that’s a totally unfair comparison, since Stanza is a free app. But if you can get a free ebook reader for your iPhone, why bother paying for the Kindle, or even a more cutting-edge reader like Plastic Logic’s? (Though of course the Amazon’s and Plastic Logic’s readers offer bigger screens, which is better for long-term reading.) People are actually downloading books, too — Choksi says one of Stanza’s content providers reports 20,000 downloads per day.