attempt to keep Photoshop from reading it. They want you to pay extra for their own raw processing software. Canon includes their software with the camera for no additional charge.
There is one aspect bugging me about whether to choose between a nikon d70s or a canon digital rebel xt. The crw raw format of the canon is fully compatible with the new photoshop and iphoto, however, the digital rebel xt doesn't seem to produce images as stunning as the nikon d70s. The nikon D70s seemed to produce stunning images, and when compared to the top of the range d2x, still looked fine if a little washed out. However, the nikons use the NEF raw format which I am not sure if its widely supported.