The D40 and the D40x are the most compact members of Nikon's entry-level digital SLR range, announced November 16, 2006.[2] Compared to its predecessor, the D50, the D40 has fewer features and a lower price: US$500 ESP as of April 2008 with the 18-55mm G-II kit lens,[3] positioning it as an entry-level model compared to the D80. The D40x (released March 6, 2007) has a 10 megapixel maximum resolution, up from 6 megapixels of the D40. The D40 and D40x (along with the D60) are notable in being the first Nikon DSLRs that will only autofocus using F-Mount lenses with internal focus motors such as AF-S and AF-I
http://imaging.nikon.com/products/imaging/lineup/digitalcamera/slr/d40/index.htm

The Canon EOS Digital Rebel camera now has a new, faster, even smaller big brother. Sibling rivalries aside, the 8.0-megapixel Canon EOS Digital Rebel XT SLR adds resolution, speed, extra creative control, and enhanced comfort in the hand to one of the smallest and lightest digital cameras in its class. Even with its advancements in ergonomic design and technology, this easy-to-use EOS digital camera is compatible with all of Canon's EF lenses, including the EF-S lenses.