Apple is offering users 20% off the purchase of all calendars and photo books created and ordered through OSX's iPhoto app until February 29, 2008.

To take advantage, simply create your calendar or photo book in iPhoto, click “Buy Book” or “Buy Calendar” and select Use a Coupon. Now just enter the appropriate code:

Photo book: NAWinterBook08
Calendar: NAWinterCal08

Aperture users can also take advantage of the photo book offer using coupon code: NAWinterBook08