Introducing the D300 — the ultimate blend of image quality, quick response and go-anywhere mobility. A new 12.3 effective-megapixel DX-format CMOS image sensor, Nikon’s original EXPEED digital image processing concept, Scene Recognition System and the new Picture Control System advance all aspects of system performance. Setting the standards for the next-generation, the D300 achieves the best overall system balance of any DX-format D-SLR.

source http://nikonimaging.com/global/products/d300/overview.htm

source http://www.dpreview.com/previews/nikond300/