PopPhoto have reviewed the 550uz now too.
DCRP says this about the EVF: "For whatever reason, Olympus doesn't publish the resolution of the EVF. What I can tell you is that it's fairly sharp (by EVF standards) and has the same auto brightening (in low light) as the LCD."
Take a film camera with you. You know that will never run out of juice. I put a battery in my battered old 35mm Minolta about once ever 2-3 years. It might be manual everything, but when I have the shots transferred to digital they are every bit as good - if not better - than my Pentax K120D.

My criteria was very similar to you and I was considering the Canon S3 IS (love Canons!) but discovered the ratio did not come in 2:3, only 3:4 meaning it does not fit on the paper when you print it out. I won't go into it, I'll assume most know what I'm talking about?
I tossed up between the Panasnoic FZ8 and Olympis 550uz and I think the former is slightly better, also it is cheaper too. according to dpreview.