I've got quote a large pinboard that sits on my desk (it's almost the size of my desk itself!). Since moving into my new place, I realised that there was actually a moulding that ran around the walls, about 3/4 of the way up.
I grabbed some moulding hooks as well as picture wire and screwed 2 holes in the back of the board to loop the wire through.
A simple one - but you know what they say. Work smarter, not harder!