If you like to have a closer look at Pentax Optio W30 and Olympus Stylus 770 SW waterproof cameras, their controls and operations you may be interested to play these two video clips below. Of course, you will have to see the dropping of each camera into water tank again.
Searching YouTube you can find more similar commercials and tons of movies shot by camera owners. You are welcome to check my paddling video clips shot with Pentax Optio W10.
Of course, I agree that these two cameras are great to use at a beach, pool or when paddling. However, keep in mind that each camera is a compromise. To get a full picture including some weakness of these waterproof cameras you should also check on-line reviews referenced in my earlier posts:
Pentax Optio W30 and Olympus Stylus 770 SW may not be in general the best digital point-and-shoot cameras available on market, but I believe that they are the best compact waterproof cameras available for paddling and water sports. My bias is towards Pentax cameras which I am using.