NEW YORK -- In the fast-changing landscape of digital book publishing there is now something called a vook , a product and company which is a hybrid of text and video, delivered on the Web and as an iPhone download . Simon & Schuster's Atria imprint, is working with Vook , a San Francisco-area start-up, to publish four "vooks," of both non-fiction and fiction. They are Promises , by Jude Deveraux; The 90-Second Fitness Solution by Pete Cerqua; The Embassy by Richard Doetsch and Return to Beauty by Narine Nikososian. The multimedia products sell for $6.99 and are available on the Simon & Schuster and Vook sites and on the Apple iPhone application store. It is not yet available on Amazon. Vooks wont be available on the current crop of Kindles as they don't support video. On Tuesday, Beet.TV did an exclusive video interview with Judith Curr, Executive VP and Publisher fo Altria Books. We have published the video on this page.