You might want to get this book and PDF file on the G9 Shortcourse
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I've had the G9 for about two and half years, and recently got the G11. I kept my G9, mostly because I also have the underwater case for it, and don't care to also buy one for the G11. The G9 takes great photos, but you need to stick to lower ISOs. I prefer, if possible to stick with ISO 80, but that's not always possible.
I also have the Canon 2x tele conversion lens, and the Canon .75x wide conversion lens. They both work great on the G9, but I can also use them on the G11. The problem is they are large, so the nice small camera becomes like a little DSLR kit, and so the extra lenses don't always come along with me. I would suggest learning to live with the limits of the zoom range. You can also learn to take two or three overlapping shots to get a wider angle image of a landscape. The Canon software for the G9 includes Photostitch software to merge images into a panorama result, so take advantage of it. It also includes RAW Image Task for processing the RAW images. With some practice you will find you can improve photo results shooting in RAW (use RAW + JPEG for convenience). RAW will also allow you to shoot at higher ISOs and get better results. You can also get some image noise processing software, some is free, to also improve your photo results. I don't need to use that software so much with with the G11, that's one thing I really like about it.
Enjoy your new camera,
Dennis