Originally posted by Art Vandelay II Sometimes I wonder how much people care about that. Most people I know prefer the construction of the Canon 40D over the K20D because it simply feels more solid....and I'd be afraid to take the 40D onto a beach. Then there's the Rebel line. Those have to be the most flimsy, cheaply made SLR's I've ever touched and yet the sale like crazy even though the price of the K20D is right in the ballpark of the Rebel xSi.
Marketing, marketing, marketing. Without kick-ass ads and a poorer brand recognition in today's generation of kids, Canon and Nikon will most often be the choice of a prospective buyer.
Peer pressure (a lot of friends owning Canon/Nikon entry-level cameras) and doing the research in-store (where a lot of salespeople push Canon and Nikon) can also tweak the scales in favor of the big two brands.