We put the GoPro HD HERO and ContourHD1080p through their paces, comparing them with this cropped video of both mounted to the handlebars of a mountain bike run.
We have other tests as well including a full side-by-side version and a split-screen example.
You can use these tests to judge out of the box performance for color, exposure, meter, and viewing angle. Both cameras in 720p mode.
Read more about it and find more tests at camarush.com