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400plus is a free firmware enhancement software which offers additional functionality and capabilities to your Canon 400D/XTi camera, in both a non-destructive, and non-permanent way. It works by loading into your camera's memory automatically upon boot-up to enhance the native camera firmware; but it is not a permanent firmware upgrade, and can easily be removed.
It is designed specifically for the Canon 400D/XTi and will not work with other camera models.
Some warning advice that everybody should read before doing anything else:
Instructions on how to prepare your camera and install
400plus in your CF cards:
A guide to understand how to configure and use
Some resources for people interested in development:
For those interested to know what has changed in each version:
See who is responsible for this great software: