Keith, you'll have the rearsets likely on Monday.
Will stop thread jacking.
Nick, other difference between the two brands is the Contour just came out with the Contour GPS. Quite simply a video camera with GPS built in. Use your imagination how that would come in handy, hiking, travel, riding, etc.
GoPro HD is also a normal Camera. If you are into taking photos like me, that's a fun feature to the camera. The timed interval photos is how I shot a lot of on-board shots.
If you are not into taking photos, that may not be a big deal. GoPro HD is turn it on and go. Someday they will go wireless on-off, but not yet.
Contour HD is super-simple on-off switch on top of camera - you can see on the pics above. Lots of differences, make sure to compare the features you want for your needs.