Canon Powershot SX10 IS and Canon Powershot SX20 IS cameras do NOT support remote control. Only Canon Powershot SX1 IS has the Wireless Controller. And that's one reason why Canon SX1 expensive than Canon SX10. Also you can NOT use a Wireless Controller like Canon WL-DC100 Wireless Controller for Your Canon SX10 or SX20 cameras simply because these cameras don't have a remote sensor built in. In Canon SX1 you can find the remote sensor just above the "Powershot" logo. This image will give you clear picture about it,
So Guys Canon SX10 IS camera does not have Wireless Controller feature like Canon Powershop SX1 IS camera has. Since there is no remote sensor no point of buying a remote Controller separately.