The Nikon D300 is the LONG awaited successor to the D200, which was introduced way back in 2005. This upgrade isn't evolutionary by any stretch of the imagination -- it's a totally new camera. Here are the most significant new features:
* New 12.3 effective Megapixel DX-format CMOS sensor
* EXPEED image processing "concept"
* Continuous shooting as fast as 8 frames/second (with the optional battery grip)
* 51-point autofocus with 3D subject tracking
* Huge 3-inch LCD display with 307,000 pixels (920,000 dots) with live view support
* Dust reduction system
* Picture Control settings let you have sets of color control settings (think Picture Styles on Canon SLRs)
* Active D-Lighting lets you brighten shadows while taking photos (instead of after)
* Rugged magnesium alloy body is sealed against dust and moisture
* HDMI video output
http://www.dcresource.com/reviews/nikon/d300-review/