Let's see....
Just out of warrenty my G1 had a charging problem. (they charger is built in on the G line, not like the more pocketable cameras). The repair cost $370 or so. Thankfully I had the extended warrenty. (It was my first digital camera)
Just out of warrenty, my s400 starts to show a e50 Memory card error. Canon will fix this for $150-$300(US). Problem resolved after I left the battery out for almost a week. Search the net on this one, it's very common.
Just out of warrenty (by one week) my in-laws SD110 fails to turn on. Nothing seems to fix the problem. I phone and bug Canon who agree to fix it at no cost out of the niceness of their hearts. Yeah, right! Takes over a month to fix.
I think there was another issue in there, but I can't seem to recall it right now.

Anyway, I really like their cameras. I think the image colour and picture quality is the best out there. I just think they need to step up the quality control a little.
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"I have no special talents, I am only passionately curious" - Albert Einstein