Just a quick heads-up for anyone wanting to start reading books from the iBookstore on their iOS 4 iPhones—the iBooks app is now available for download in the App Store. In fact, if you go into the App Store from the iPhones itself, you’ll get a notification letting you know that iBooks is available, and asking you if you’d like to download it right then and there. As Apple announced at WWDC 2010, iBooks for iPhone will sync your book data, including bookmarks, notes, pages read, etc., across all iPhones, iPod touches, and iPads that you have them running on.