You may not need a reader...

The Canon S30 should come shipped with an USB lead with a standard USB plug on one end and a smaller plug to connect to the camera (under the port cover on the side of the camera by the LCD screen).

So, basically, with the card in the camera;

Plug the cable into the camera
Then plug the lead into the USB port on the PC
Switch on the camera - it should recognise it's connected to the PC and automatically adopt the right mode
The PC will recognise the camera as an external hard drive, and should open it in Explorer (if not, goto My Computer and you should see an extra drive, double click to open).

It's then a simple matter of dragging and dropping the image files/folder(s) off the camera onto your PC.

Let us know how you get on, or if you have any problems pop back.