The Canon EOS Rebel X line of consumer-oriented D-SLR cameras has made its indelible mark on the market. Canon sells tons of these models--and that's why the Magic Lantern Guides and DVDs that explain how to use them are bestsellers too. The Rebel XSi (the EOS 450D outside of North America) is the most recent update, and it's bound to be a hit with its 12.2 MP sens? fast-focusing 9-point AF system; and large 3.0-inch LCD monitor with Live View function...