More Olympus E-P1 picture samples.
I'd call 1600 ISO mission-critical quality, something you certainly can't say for any small-sensor camera.
And the 17mm lens (34mm equivalent)... look at the full opening (F:2.8) samples. That is damn sharp for full opening! And a super-compact lens too. Well done, Oly.
Update: sadly, according to early reports it seems autofocus speed is not quite as exemplary as that of the Panasonic G1. If true, this is a shame, for it's pretty important for candid photography use, which this camera would otherwise be ideal for.
Related report. (Use of Panasonic M4/3 lenses is an interesting thought. Their long zoom is nicely compact, for example. And I think they should be fully compatible.)
Update: another good article. Also this one.