Cameralabs produced a great in-depth review of the Canon EOS 400D / Digital Rebel XTi camera.
Ultimately the Canon EOS 400D / Rebel XTi is a great entry-level digital SLR which improves on its predecessor in many respects. It has higher resolution without compromising noise levels, a wide variety of anti-dust features, a bigger screen which doubles-up for detailed shooting information, the AF system of its bigger brother and fast overall handling. The only thing that’s missing is a cheap lens bundle with Image Stabilisation. This will undoubtedly have potential buyers carefully weighing it up against the Sony Alpha A100 which costs much the same, while those looking for a tougher product may be tempted by the Nikon D80.