
In Japan, it's model name is Digital Kiss, and called Digital Rebel in North America. It's not "D300" it's 300D (according to Canon)
http://www.dpreview.com/reviews/canoneos300d/
"... This digital SLR based on the EOS 10D's superb six megapixel CMOS sensor and image processor in an inexpensive consumer body similar to the film EOS-300. This camera is designed to take the prosumer end of the digital camera market by storm, everyone is fully aware of the image quality of the EOS 10D (considered by many as the benchmark six megapixel digital SLR), and so a consumer priced digital SLR based on the same sensor is irrefutably attractive to anyone who would have previously considered an 'all in one' prosumer digital cameras."
Another excellent review from photo.net
http://www.photo.net/equipment/canon/300D/eos_300d_review.html
Review from imaging-resource.com
http://www.imaging-resource.com/PRODS/EDR/EDRA.HTM