A couple of pros who are excited about small, serious cameras have put the new Olympus E-P2 through its paces:

E-P2 shoot by Kirk Tuck at the Visual Science Lab

E-P2 review by Steve Huff at Steve Huff Photo

I found both of the above at 1001 Noisy Cameras, which really is the site for obsessed camera fans.  You can see their full Micro Four Thirds coverage here.