Congratulations on the S3IS. I have one and I am delighted with it. It is v. flexible and has so much in one package.
Have you got yourself a polarizer yet? It is great for giving more impact to shots, especially to our Irish skies. You’ll feel as f you are back in OZ.
It is a circular piece of glass which is attached via an adapter to the front of the lens. I use it mostly for enhancing skies, and for cutting down reflections eg from water [like polaroid sunglasses]
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If you want to find out about more goodies for te S3 try a look at dpreview.com
Enjoy the camera!!