What is the importance of Ayatul-Kursi?

Ayatul-Kursi (Qur'an 2:255 ) is generally said to be of great benefits e.g. it's recitation is encouraged in order to come under divine protection among many other. Sure it speaks of His Throne. But what makes it so important? Is there a tradition from Muhammad (saww) which speaks of its importance (at such an exalted level)? Also, traditions speaking of it's protective nature would be appreciated.