When I'm not reviewing surf books, I run a mobile software company. Each year I go to Barcelona for a large mobile conference, and this year I saw something pretty cool. A completely waterproof mobile phone from Fujitsu. I believe they are all Android phones. They actually had the phones sitting in tanks of circulating water.
Now, before you all shit all over me for putting cell phones in the line-up, just know that I'm only sharing this for the pure geeky coolness of it. Would I get one? Probably not, but it would provide a nice slim camera for documenting your friends dropping in on you.