One thing Nikon is bad about is not including it's Raw image editing software with the camera. It usually ships with a lite version. To get the full version you have to fork over another hundred or so bucks.

Not really sure if the D200 ships with it or not. The D70 didn't, and the D80 doesn't.

I use Photoshop CS2 and it's Raw plugin, but I've heard the Nikon software works really well.