I have one of the HD Hero motorsports camcorders and the camera is awesome. The only thing I don't like about it is that you can't see what you are recording on it because it has no LCD. That makes it really hard to get the shot you want when using the thing away from a computer. Newer GoPro cameras have a port on the back for expansion.
GoPro has announced a new LCD BacPac that is made to use that expansion port and adds a LCD to the camcorder. The LCD will let you see what you are filming as you shoot the video. You can also use the screen to view any video you recorded previously.
The LCD BacPac ships with two new backs for the enclosure that holds the HD Hero cameras to keep them safe from water and shocks. The LCD has an integrated mic so you can hear the sound from your recordings as well. The BacPac sells for $79.99 and is shipping right now.