I am a G9 owner and I love it. The G10 should be even better. The wider lens makes a big difference in the G10 and I myself am tempted to upgrade. I also use mine every day. Seriously.
The only thing I do not like (but this goes for all point/shoot digitals) is the shutter lag between pressing the the trigger and when the camera actually takes the picture. Hard to take motion shots with the lag but, like I said, that is common on all point and shoots.
I love all of the manual override features and the ability to shoot RAW. I also bought the Canon water housing for about $70 new. Once they pack a CMOS sensor in one of these things I will be ever so pleased. Until they do, sensor noise at higher ISO's is going to be a regular thing.
I also love the time-lapse video feature. SUPER fun. Check out this one I made while taking my folks on a cruise to Alaska. (By the way...cruises are awful. Simply awful)
http://www.vimeo.com/1456878Shoot me an e-mail if you have any specific questions.