Thanks for those useful suggestions.
Bob - I've used the 2s timer, and held my breath to capture some shots , wide F# etc. when I couldn't find a suitable makeshift tripod (I have one which I obv. don't always carry). I just think that I need something (or a system) which copes better in low light. I'm not sure if I should upgrade my lenses (I have the cheapo but decent kit lenses) or look for another system which copes better with limited light (eg - Nikon, apparently).
My old 2004 superzoom has an f2.8 wide open which seems to make a bit of difference at an equivalent ISO.
I don't really want to have to spend time on PP if there is another system/option which can avoid this.
So what's the deal? go up a notch on ISO and lose IQ or go down a notch on shutter speed and lose sharpness?
And Enche Zein, I'm not sure I know what you mean by:
The Nikon D90 is about 1 1/3 stops better in low light than Olympus 4:3
do you mean the camera ISO performance or the kit lens speed, or something else?
Panasonic G3: 9-18mm, 14mm, 20mm, 45mm