Below is a link that explains several different features of interactive whiteboards. This is a great resource that shows how to incorporate different activities while using a SmartBoard. The website has interactive games/lessons that can be used on a SmartBoard.
Some disadvantages of SmartBoards is that only one person can write at one time and the only markers that can be used on it are the SmartBoard markers.
SmartBoards do make learning interactive. The SmartBoard acts as a board and computer. A teacher could pull up a passage and highlight and circle right onto the board. The SmartBoard provides great visuals.