SandyUT,
I can't answer Scott's camera setup exact camera setup, but I do know he was using a point and shoot camera. My girlfriend and I started with this setup using a Canon point and shoot with the Canon underwater housing designed for it. The size is wonderful and it's not that expensive, we tend to dive with it all times on her BC for "just in case we see something cool moments". As a point and shoot, it tends to struggle with pictures, meaning they'll come out very blue and you'll have to color correct everything underwater, but the video is very impressive for such a cheap and compact option. Get a big memory card for it and you can come up with lots of video. I think it's a good place to start, gives you a very versatile little camera for both land and underwater.
We have since upgraded to an actual video camera and housing, plus a housing for our DSLR. Way more money, much more thought has to go into dragging them along, and we STILL carry that point and shoot with us. When I think of the money spent on this hobby, that point and shoot, for me is one of those things where I'll say it was totally worth every penny for how much we use it and what we get out of it.
We only dove one day in January, turns out the last day of the month, but the temps were 81 on every dive we did and at every depth, down to 113ft for me.