The Canon Powershot D10 will never, ever fit into a pocket unless you are MC Hammer, circa 1990. That's because it houses a telescoping lens in a bulging case, making it look like a sub. Still, shots are pretty.
The Price: $329
The Waterproof-ness: Good down to 10 meters, making it suitable for light diving and heavy snorkel duty, as well as making it impervious to higher pressure of waves that may slap you and the camera around at lesser depths. The most waterproof camera without a housing, by far. And although they don't do a great job of advertising it, the camera is actually good to 14 degrees F and is shockproof to 1.22 meters, so its at least as rugged as the Pentax W80 I looked at last week.