I would also consider a Leica D-Lux 4.
All P&S cameras involve compromise. You just need to decide what you are willing to compromise on and what you are not willing to compromise on based on your shooting needs.
Unless you're the sort of person who likes paying a $300 premium just to have a pretty little red dot on your camera, the Panasonic LX3 would be a better choice. Apart from some minor differences in jpeg (but not raw) processing, they are exactly the same camera. And the LX3 is once again readily available, after being difficult to keep on the shelves until now. It's really a no-brainer, choosing between the two. Of course, I love my D-LUX 4 and its pretty red dot.
As far as the S90, it seems to have better handling than any other compact on the market, and has a lens that strikes a good compromise between large aperture (f/2 on the wide end) and zoom (28-105mm equiv). I'd get one if I didn't already have a D-LUX 4.
Of course, if you want a telephoto zoom, none of these cameras will be suitable. Since the S90 is your jumping off point for this thread, I'm assuming that's not the case.