Digital imaging buffs are certain to experience a whirlwind autumn, but there's nothing on the books saying that manufacturers need wait for the biennial Photokina expo to roll out new models. Just in time for the back-to-school season, Canon is announcing two new superzoom cams -- the SX160 IS will serve as the successor to the SX150, while the SX500 IS is an entirely new camera, set to sit alongside the company's SX40 HS and SX260 HS point-and-shoots. Both new m
