Here's a handy hack I've been using lately to carry a map and notes along with my hacked Moleskine Weekly Planner notebook.
I use a standard 3" x 5" yellow sticky note to draw a map, with directions, address, phone numbers and whatever else I might need to get to my meeting.
Then I attach the long, sticky edge to the spine side of the Moleskine (left edge) and then slide the loose edge of the sticky note under the elastic band (right side), so it won't catch the corners in my pocket.
Once I'm done with the map, I can save it in the back of my Moleskine planner for later use, or toss it out.
This approach also works well for task lists and any other at-a-glance information you need to see without opening up the Moleskine.