We all get swayed, distracted and pulled away from our reasons for doing what we do. Therefore little reminders to keep our thinking from getting woolly and our eyes on the big picture can be very useful.
My whole interest in notice boards comes from a friend and former colleague with whom I shared an office for two and half fun-filled years. Despite his many flaws I still miss him terribly. His digital version of his old noticeboard can be viewed here, his new one here, thanks mcgurgle.
#5 Loris Malaguzzi on the psuedo-democracy of teachers