Nursing students who are tired of hauling around heavy -- and expensive --  medical textbooks will be glad to learn that electronic textbooks are taking a big step closer to reality. Software developer ScrollMotion has signed a deal with major textbook publishers, including McGraw-Hill, Random House, Wiley and Kaplan, to adapt their books for the soon-to-be-released Apple iPad. But don’t get too excited just yet. The e-textbook has a ways to go before it becomes widely available to students in nursing programs and elsewhere. Of course, publishers love the idea of creating electronic versions of their medical textbooks -- because of the savings in printing, production and storage costs, as well as the ability to update the books virtually.  And e-books have features that are particularly useful for the student, such as instant access to specific references; and brighter, more realistic graphics. Yet, electronic health textbooks have been slower coming to market than other educational materials such as medical journals, manuals and study guides. This is in part due to e-books’ limited technical capabilities and interactivity, which has held down demand among nursing students and others.  That is about to change. As McGraw-Hill executive Rik [+]