I'm now looking into this as well.
I have an older Olympus 1030SW that I've used for classes in the pool and as my pocket camera on trips for years. Love it. It's finally given up the goose though and is no longer waterproof outside the Olympus PT-043 housing (good to 130'). So I'll keep this camera as a unit for the case, coupled with a Sea & Seea DS-90 strobe it takes pretty good pix.
But now I want to get a new pocket / pool camera.
I was looking at the same list above, + the updated Olympus TG-810 and the new Nikon AW-100.
I liked the review of the Pentax Optio WG-1 from Steve's Digicams, but he's much more above water than below. Anyone know of reviews for these other camera models or head to head testing?