The Canon P&S S70 uses the RAW compression format while the s80 uses jpeg only. Too bad Canon removed this feature! There are no plans for adding this back in per their Tech support.
I have my P&S S80 housed in an Ikelite plastic casing and it has access to all camera controls. The movie clips at 30 fps 640 res is very good. the 1024 captures at 15 fps only and the motion is a little jerky at this setting.
Maybe someone will hack the S80 digital cam software to get it to save the images in the RAW format, so far I’ve heard it’s been done to the A610,620 models.