The G10 has the digic IV and Canon has fallen behind Nikon in terms of reducing noise. It will be interesting to see how it peforms at low light, high ISO vs the G9's DIGIC III.
There is also this camera that comes in about $100 less than the G10 with 20x zoom, DIGIC IV....
http://www.gadgetell.com/tech/tag/digic%204/