I'm getting addicted to it. It's a great way to put your artistic expressions to a semi-practical use. It's also a great way to "snapshot" journal. I'm being more consistent lately in the 9 1/2 x 13 inch calendar/book I made. Here's my November page:
The aprons lift for journaling underneath. Check out other art calendars on Flickr - there are some super creative ones out there.