The SX models are a more compact, affordable spin-off. The "SX" stands for "Super Zoom." All S and SX models feature image stabilization and full manual controls. The "SX IS" series cameras replaced the very popular and capable "S IS" series.
Canon Powershot SX Series Cameras:
SX1 IS, SX10 IS, SX20 IS, SX30 IS, SX40 HS
SX100 IS, SX110 IS, SX120 IS, SX130 IS, SX150 IS
SX200 IS, SX210 IS, SX220 HS, SX230 HS, SX260 HS