I really do love the Canon PowerShot set-up for their digital elphs. I've owned three different models, and the SD630 is my current favorite. Unfortunately, as did the SD200 and the SD600, it has "problems".
Unlike the others, the SD630 has a digital video function that doesn't have a time limit. There is a small microphone near the button you press to start filming however, which is pretty inconvenient when you're filming yourself. I've accidentally covered the mic more than once, and wound up with extremely muffled or wave-ridden audio.
It is extremely convenient though, at just under the size of a deck of cards. I usually carry my camera in my front pocket so I can whip it out and capture all those surprising funny, family moments.
There are a variety of settings for widescreen shots, night shots, etc. There is only 3x zoom, which is a pain, but the SD630 is a 6 Megapixel camera.
An issue with Canon unfortunately are phantom operational problems. For months, I couldn't get the lens to retract, but after giving it a few weeks off, I tried to turn it on again and it worked like a charm. The same thing happened to our SD200. Now it's working fine, but it's USB connection won't recognize anything.
Next week it will be something else, and don't expect Canon to honor their warranties. Any problem with your camera, even a smudge on the opposite end from the problem, will likely be used as a reason to charge you up the river and back.
At the end of the day, it's worth it though because the camera is cute, small and very easy to use. It's also on the inexpensive side for the features it has to offer.