CourseSmart LLC offers e-texbooks free for subscribers, on iPod.

The Wall Street Journal is reporting that CourseSmart LLC , an e-textbooks provider for college students with more than 7,ooo titles, is making its collection available on Apple's iPhone and iPod Touch, free for its subscribers.
Typically, students rent an e-book for 180 days and during that period, they will have full access to their textbooks, can consult their digital notes and do researches for a specific word or phrases right from their iPod or iPhone.
At the end of the subscription period, students will lose access to the titles. But at nearly 5o% savings per tittle for 18o days which is typically the length of a semester, that is not a bad trade off considered the short shelf life of a physical book and the hassle of figuring out what to do with it at the end of a term.