Nikon D300s review at Fotopolis and Register Hardware (updated)
Fotopolis has just published their nine-page Nikon D300s review! Look for the numbers 1 through 9 at the bottom of the page to visit the different sections. Of technical interest, the intra-camera ISO-range tests, and the full-size sample pictures, which include a mix of real-world and technical (yes, color charts and resolution chart)..
UPDATE! One more review has gone live since the original post. The new review is coming from technology website Register Hardware. They have an intra-camera ISO range comparison (click each image for full-size JPEGs), and using the same scene, they also check out the "film modes".
For more on the camera, be sure to check its list of reviews, which includes dpreview.