This site gives away a business book every day of the week.  Those who enter get the chance to sign up.

 Now, I don’t know how they make money, but I’m guessing whoever sponsors the drawing of the day gets a list of all the people who sign up for the giveaway.

Then, they send you email offers or mail you junk.

Who knows.  But it might be a good way to get a free book, so we mention it here.