Well, I should have been a bit clearer. I use the high ISO for my personal stuff, not art/work. You're right about artifacts although here's a sample I took @ 3200:
Very acceptable for a 480x640 photo album collection, but there's no way in hell I could blow it up any more before it becomes a pixelated nightmare. But I really wanted it for all the shows I go to where finding a nice still spot in a pit is impossible. The "anti-shake" mode brings up the ISO to 800 which is still acceptable as long as you deal in smaller formats. In terms of work, I only shoot in the day unless I'm fine with 200 and going for the artsy "action" technique which actually worked in Paris:
and at the occasional show:
My line of work is scenery for offices, mostly hospitals, so I need picture quality to hold up to poster-size. Until low-light DSLR performance improves, I'll stick with my EX for my all-around since it's clearly more portable than a traditional SLR and there have been plenty of times where I'd rather not draw attention to myself like a tourist, such as in Cuba:
The EX, btw, already had a firmware upgrade but it was nothing on the USB side of things. 2.0 should have been automatic but a 2.0 reader is only a few bucks these days anyway. Thanks for the compliments.