Free Online Textbooks With A Catch

Interesting article from the Christian Science Monitor:

On the first day of the class finance professor, Yash Puri, told students they could download their books from the Web free of charge. The catch? The books contain advertisements from a number of companies including FedEx Kinko's and Culver's - a fast-food restaurant in the Midwest. The ads aim to lighten the financial burden on students created by rising textbook prices, yet some critics worry that they will dilute a book's editorial integrity.

[RJ]