Gordon Laing of CameraLabs.com reviews the Nikon D40X digital SLR. The D40X is basically the same camera as the Nikon D40 except for a big difference in resolution: The D40 has 6 megapixels and the D40X has 10.2 megapixels resolution.
The sensor in the Nikon D40X is the same as in the D80 and gives this camera a wider ISO range and faster continuous shooting (3 fps instead of 2.5 fps). The D40X is compact and well built with an excellent grip and is good at metering and giving you the correct exposure for the scene you are photographing.
Gordon gives you an in-depth tour of what it is like to use the D40 with plenty of footage from the 2.5″ LCD screen - including the help and menu system. There are a few flaws in the D40X such as the 3 point auto focus system, which is fine for some applications, but for taking photos of subjects that are moving all over the place you will be better off with a 9 point auto focus system as found on the Canon 400D Rebel XTi.
Ultimately if you really like the Nikon D40 but just want more resolution, the Nikon D40X will be the camera for you.
Nikon D40X in depth reviews and sample photos:
CameraLabs Nikon D40X Review
DPReview Nikon D40X Review
DCRP Nikon D40X Review
Nikon D40X sample photos on PBase
Nikon D40X sample photos on Flickr