The number of sales of the Steve Jobs biography will be comparatively small for the iBookstore. Publishers and analysts say the iBookstore is still relatively unknown to the general public, especially compared to all the other apps on an Apple screen.
iBooks. The iBooks app that originally appeared on the iPad is now available for the iPhone as well. That includes a new capability to read any PDF files, and iBookstore integration. You only have to buy a book once and it's available on all your iOS devices. iBooks will automatically sync your place, bookmarks, and notes
Perseus Books Group and Workman Publishing Company, both independent publishers, signed deals with Apple to sell electronic versions of their books on the iPad.