As of tonight here is what they're offering:
Oct. 2 - Cool Science Experiment Videos
Oct. 7 - Rainy Day Activities for Kids (e-book)
Oct. 8 - The Story of the White House (audio download)
Oct. 9 - Columbus Discovers America (audio download)
Keep in mind that these links do not work indefinitely, so if you see something you're interested in, you might want to go ahead and download it now. :)
While you're there you can sign up to receive weekly email updates of what they'll be offering each week.
Don't you just love freebies?!