Synthesis, extraction and purification -- Molecular and crystal structures -- Electronic states and structures -- Carbide and nitride metallofullerenes -- Non-IPR metallofullerenes -- Other type of metallofullerenes -- Non-metal endohedral fullerenes -- Scanning tunneling miscroscopy (STM) studies on metallofullerenes -- Magnetic properties of metallofullerenes -- Organic chemistry of metallofullerenes -- Applications with metallofullerenes -- Growth mechanism -- M@C60 : a big mystery and a big challenge