Sean Reid has published Part 1 of his "rolling review" of the Sigma DP2. Sean's site, Reid Reviews, is a pay site, meaning that one must pay a $32.95 fee yearly to maintain access to the content. There are no advertisements.

Many are used to ad-supported content and averse to paying for content on the web, but Sean's reviews are far higher quality than most if not all of what you'll find elsewhere. The reviews are both photographer-oriented and technical, often pointing out subtle but significant findings which are omitted in reviews done by writers who are not working photographers.

These are just a couple excerpts from the DP2 Part 1 review showing the sort of fine points Sean makes in his reviews (click to view larger):

Again, those are just snippets from an extensive Part 1 review.  There is a great deal of useful information in the review.  If you are willing to pay a subscription, I highly recommend Reid Reviews.

Also, don't miss these excellent reviews at The Online Photograper:
T.O.P.: Sigma DP2 Review (link)
T.O.P.: The Sigma DP2: A Second Opinion (link)