I bought a G10 specifically for street photography and almost sold it because I was INITIALLY unhappy with the results I was getting. It had ALMOST everything I wanted, but the shutter lag and a-little-too-touchy controls were really getting in the way of spontaneous shooting. Then I read a blog post about that changed my experience completely, and ever since, I have been absolutely thrilled with my G10 as a street shooter. NO shutter lag anymore, exposures about 95% within a usable range as long as you have a little bit of PP skill, incredibly easy to return to the settings in an instant.
My son has a G11, I helped him set it up the same way as my G10, and because there's an extra stop or two of ISO range before sensor noise overwhelms the photo, it's even BETTER for street.
Here's the post
that will change your street shooting experience (long and detailed, but worth every second).