As usual, it features a post card on the back of each month. And this year, there's one on the back of the cover too - giving you 13 post cards. I use post cards all the time -- for sending notes of course (thank you, happy birthday, etc), gift tags (I cut them in half to give me more), and sometimes to spruce up a to-do list. I think these calendars make such a great gift on their own, but anyone who likes to send mail will appreciate the added value in the post card feature.
Go check it out here!