I used chalk board paint on my inside of my pantry door. (thegunnysack.com)
If you put a dry erase board on one side, you could paint magnetic paint under the chalk board paint on the other side so that people can still tack stuff up. (susieharrisblog.com)
The kitchen wall has been turned into a giant chalkboard by painting the wall in black board paint. (idealhome.co.uk)