Canon G9 JPEG vs RAW
In-Camera JPEGs vs JPEGs from RAW files
It's often the case that a good third-party RAW converter can extract a lot more detail from a camera's RAW files than the camera's own internal processor can. RAW conversion software also generally gives you much more control over how to make the tradeoff between subject detail and noise suppression, better control over the sharpening process, and better control over tonal rendition.
Much of this appears to be the case with the Canon PowerShot G9. While it does deliver very nice JPEGs right out of the camera, Adobe Camera Raw (as just one example of a third-party RAW converter program) manages to find quite a bit more subject detail, particularly at low ISO settings.