G11 has the heft that may or may not suit individuals. Also, from personal experience, it was difficult to find a decent case for the G11 because its dimensions are quite unique, but since then I've got 2 cases for it (1 leather and 1 nylon) so let's just say it's not impossible.
My girlfriend, on the other hand, has indicated her interest in an S90. Her reasons are that it's smaller and lighter than the G11, yet has more or less similar features to it (minus the manual dials). In terms of image quality, I think they are on par. The S90 does resemble the Canon IXUS series (IMO at least) albeit lacking in colour choices. It is slightly cheaper, too.
Just sharing my views and experience. Now it's up to you
good advice..
But the S90 does have Manual Dial too. unless you talking about the ISO and Exposure compensation type of Manual dial. :bsmilie: