Here's a few reviews.

NEWS! - Test Shots posted for Panasonic G1! (http://www.imaging-resource.com/NEWS/1224800844.html)
http://www.nytimes.com/2008/10/23/technology/personaltech/23pogue.html?em
Panasonic Lumix G1 pre-production sample shots - Page 1 - CNET Asia Photo Gallery (http://asia.cnet.com/photogallery/0,3800005208,62047576,00.htm)

Here's a review with good looking examples:
Panasonic Lumix DMC-G1 Review (http://www.digitalcamerareview.com/default.asp?newsID=3788&review=panasonic+lumix+g1)