With over 7,000 text book titles, CourseSmart 's eTextbook reader iPhone app is now available via Apple’s App Store. Only thing that may propose to be a downfall is that you will have to view the books using CourseSmart's servers which means you won't be able to store the books locally. Internet connection may be an issue here.

via: CourseSmart’s eTextbook reader iPhone App - Specs, reviews and prices.

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