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If your camera came with a CD, there should be a few apps on there. My parents' A60 came with PhotoStitch, RemoteCapture (the remote control app), and FileBrowser (I suppose it's like iPhoto).
 
check the canon website. i know there is one for PC for canon's and i believe mac's. i think i have hooked up my s40 that way once.
 
I did this with my S50 too... It is part of the ImageBrowser suite.

It would be cool, though, if there was s/w to use the camera as a webcam. I don't know that such a thing exists, sadly. :(
 
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