The Canon S90 is really an amazing cam. The noise control is very good for a almost pocketable P&S and the good thing about it is how much details it has even after the in-camera noise reduction.
Mind you, I have the Fuji F20 and F31 too and I can say these Fuji has low noise but they make pictures looks like water color after the in-camera noise reduction! Furthermore, the Fuji legends at a mere 36mm widest is not an useful tool to me!
Lumix LX3 probably better IQ than S90 but it is just too big to be a everyday cam for most people except the more hard core one.