In the electronic world rapidly growing especially  e-reader such as Amazon Kindle, Samsung e-reader  or Sony kindle.Currently for iphone 3GS users can also be used for e-reader to read e-book.The Apple partnership with CourseSmart to create applications in iPhone.With CourseSmart application can store textbooks, one of the suppliers and electronic books, all textbooks will be changed to e-book.In the northern California supplier of electronic textbooks on Tuesday released free software that makes digitized forms of college textbooks available on Apple’s Ubiquitous iPhone or iPod Touch devices .For a while this is only valid in the United States and all students Kanada.So those two countries only need to bring iphone to replace all their textbooks .The CourseSmart iPhone program is available at Apple’s online App Store.