One of our favorites is the inside of a pantry door where you can write down things as you use them, so you have an instant grocery list.
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How about jazzing up a coat rack where you can leave each other notes. What time is dinner?
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Make a calendar out of an old window, just paint the glass with chalkboard paint and hang it on the wall.
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Clean up a file cabinet and have a bulletin board too.
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You can get chalkboard paint in many colors and even in metallic, so magnets will stick to it.
If you are a real Do It Yourselfer, you can even make your own chalkboard paint, Click Here to see how.