Information When it's Needed.
At the beginning of the year, I bought an daily calendar with photos from the National Gallery of Art for each day. Each day is a single glossy photo on heavy card stock. To save on paper, the manufacturer printed one day on each side of the cards.
At the end of June, one of the cards had instructions telling me to flip the whole stack of cards around to start the second half of the year.
That's good usability, people. I got the information right when I needed it; rather than having to fish out some documentation from 6 months ago.