Here is where I’ll collect links to various discussions, comparisons, tests and reviews pitting the Nikon D40 against super-expensive D2X.
Nikon D40 vs Nikon D2X images samples
This collection of full-sized image samples from the D40 vs D2X as submitted by Somac showcases photos shot with the two cameras at all ISO values. You can read the related forum thread for more discussion on these pics.
Body size comparison
See how small the D40 plus Nikkor 70-200mm f/2.8G ED-IF AF-S VR is next to the D2X, and also read the favorable impressions the Nikon D2X owner has of the D40 in terms of its snappy operations and AF performance.