From the site:
Here's How It Works:
1. Kids read any eight (8) books of their own choosing.
2. Kids use the Summer Reading Journal to tell us their favorite part of each book. A parent/guardian signs the journal when it's complete. You can also get a Spanish-language Reading Journal.
3. Children bring their completed Reading Journal to a Barnes & Noble store between May 26th & September 7th, 2009.
4. We'll give them a coupon for a FREE book! They choose from a list of exceptional paperback titles.*
* Eligible books will be listed on the coupon. Choices must be made from available stock. No special orders. Limit of one (1) form per school-age child (grades 1-6), please. Incomplete forms will be ineligible for free books.