If you don't have an account yet, you can sign up here. They have an on-line catalog where you can buy gift cards, toys, magazine subscriptions and many other things with the points you've earned.
TWITVJB16CD2011 (expires 12/16)
My favorite diapers are the Cruisers Dry-Max, they are so thin and don't get all bunched up.
Make sure to check out all the other codes I have posted here!