Actually they BOTH look like killer cameras. The lcd screens look like they could be incredible. 51 pt AF! on both cameras. 8fps on the d300. looks like nikon is doing what people think canon will never do ie; have 2 cameras very close in specs in very different price ranges.
The new 5d should be a killer, and I just happen to expect to be in the market for one when they are released next year. If canon doesn't respond, I cant see myself buying a 40d with that d300 just a few hundred more