Here is a video I just put together from my latest dive trip to Cancun. The still photos are with my Canon point & shoot. All the video footage is with my GoPro2 with flat lens. A flat lens is a must. My current flat lens floods often, so I will soon pick up the new $49 GoPro Dive Housing that just came out. Love it!
http://www.youtube.com/watch?v=S8ZvUXrWipo