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Canon Digital Ixus 30 or 40?

I'm getting a bit confused between the two.
There seems to be more difference than just the pixel count.
The controls on the back look different as well.

I have the original Ixus which came out about five years ago.
I love it and have used it nearly every day - but these new ones seem
worth upgrading to - because of the faster response to the shutter
button.

Please help me to choose between the 30 and 40.
--
Chris