Just found out about it myself, but ill try to explain it for those who dont know it yet 
Smart cast allows you to cast spells like heal or shield - targeting the cursor. If you use smart cast with buffing or healing spells with no allied target under the cursor, they will be cast on you.
the smart cast hotkey is alt+qwer
half ripped from http://www.leagueoflegends.com/board...ad.php?t=71943 (found out about it there too
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