Another big up for the S90. Got one (from Kerso) as a pocket cam (my other being the 5Dmk2). Loads of manual control options if you want them (I do) or it will behave like a standard compact if you don't (wife mode*).
The only minor criticism I have of it is that the way I hold it, one of my fingers often finds itself under the pop-up flash. Can't seem to get used to it and remember not to hold it there for some reason. Other than that, its great.
*No offence intended to any female/spouse 'toggers intended but my nearest and dearest only cares about the shutter button.