I too have been thinking about this, but when I weighed up the arguements for and against, is a lot of money for 100 ISO shooting camera, as anything above ISO 400 is not good. The extra MP (14) on the G10 has issues with details if your printing big as well, and the price you pay isn't far off 450D camera body money, which would give better all round performance than the G10 or 9. So my conclusion was, it was too much for so so performance unless under optimum conditions. Good, but not good enough for the $$$$
So I was looking at the panasonic TZ5 if you only want something small that fits in your pocket, less than £200 28-280mm zoom range and has some great reviews, gadget show even recommended it as an alternative to the G9/10.
Another canon than has some good reviews is the powershot SX-10, the replacement for the S5, with a 20x zoom. The problem you have with all compact are the sensors are small and performance in low light are not good
Peter