http://www.flatworldknowledge.com offers a very unique business model under which a student can read a book for free online but would have to pay if they want to download or print a portion of the book. If successful this can help reduce the cost of education drastically.
Few of my concerns are:
1. Availability of books: I believe no major publisher is participating in this currently
2. The quality and user experience of reading online is not great and it seems like the website is forcing you to print or download the books.
The only factor that can make this model succesful is if the teachers start recommending these books and if both students and teacher give feed back to improve the quality of the content.
Check out yourself and let us know what you feel.