I LOVED my Nikon Coolpix S640! Unfortunately, it didn't survive a recent fishing trip, even though it never got wet or anything. I don't know why it quit, actually, but quit it did.
Figuring I need a sturdier camera for fishing trips, but one that takes good enough pics & video since I really use it for EVERYTHING, I decided to go with the Pentax Optio W90. It is rated as waterproof to 20' deep for up to 2 hours continuous submersion, shockproof from a 4' drop onto plywood (interesting rating), dustproof, and cold-proof to 14 degrees Fahrenheit (can you say ICE FISHING?).
It will take underwater pics and video. As pleased as I was with the Nikon, I'm expecting SOME trade-off between picture quality and ruggedness with this Pentax. But so far the pictures I've taken seem reasonably good. Here's some examples of what I've taken so far:
White Bass from fishing today during lunch: