There is a new review of the Nikon D300s posted at CameraLabs.com
They’ve added HD video capabilities to the D300, which is a big yawn to me, the best new features are the quiet shooting mode and the addition of an SD memory slot.
“With the D300s, Nikon’s taken the already highly capable D300 and further enhanced it with a number of features – some expected, others less so. The inclusion of a movie mode was a predictable, although welcome upgrade, and the microphone input a very useful addition. The Virtual Horizon and Quiet mode are minor but handy gadgets, and we’re also pleased to find Live View now relocated from the Release dial to its own button, allowing you to easily select drive modes whether composing with the screen or viewfinder.
One thing is for certain: Nikon no longer has the top-end cropped-frame DSLR market to itself. But regardless of how the 7D measures-up, the D300s will remain a superb photographic tool which is a joy to use, and ideal for the high-end enthusiast or pro wanting a backup body. It easily comes Highly Recommended, but unless you’re 100% committed to the Nikon system, be sure to compare very closely with the EOS 7D.”