I'm not familiar with the Canon S3, but I am familiar with a different one that I would not recommend - the Canon SD750. I bought one to carry around instead of my DSLR and was extremely disappointed. I have an older Olympus P&S, so I already knew what differences to expect between DSLR and P&S. Nonetheless, the SD750 was really, really disappointing and really, really irritating. It went back after one day of blurred shots, missed shots, underexposed shots, etc. Maybe it was defective, I don't know, but I did not give it a second chance. Returned it for a Panasonic Lumix TZ3 and was literally blown away by the results from that little camera. The 10X optical zoom with image stabilization produced results that I would say rivaled my DSLR. Just my $.02 worth, your mileage may vary, and all those other popular disclaimers...