I think it's a little unclear, but Kamen has actually introduced TWO devices. One is a water filter, and the other is a generator (which can be used to power the filter). It's not a single magic box that generates clean water AND electricity.
The watt capacity makes perfect sense, actually. It's true that units of watt-hours are used for amounts of energy consumed over a period of time (as in billing) and energy capacity (as in the capacity of a battery), the number quoted here, if you read about the machine, is that it is a Stirling engine powered generator with a continuous capacity of 1kW. If it ran for one hour, then it would have generated one kWh of electricity, if it ran for ten hours, it would have generated ten kWh, but regardless, it's pushing electrons at a rate of 1000 joules per second.
The scientific validity of this demonstration is negligible. I don't think that's what they were going for anyway. It's just a demonstration of how the "exploding laptop" process proceeds. The method that they used to induce the explosion and flare-up (namely, putting the laptop on a hot plate) would cause most sealed-casing batteries (not just laptop batteries) to explode or otherwise rupture and leak nasty chemicals. Real laptop battery failures are caused by a number of variables being met as a result of manufacturing defects (or poor design), operating conditions of the computer and other stochastic variables that can't be predicted.
If you read the linked article, you will see that the cost of the TX Active concrete is quoted as being one third more expensive than traditional concrete. Titanium dioxide (the active "ingredient") is very commonly used already in various industries, so I can't imagine the cost of producing the compound is too shocking. Using TiO2 for this purpose isn't a new concept, either, just a new application of it. The materials division of Mistubishi rolled out a similar product in the form of pavers a while back.
I didn't follow through far enough to see what this particular device looks like, but a couple of months ago I came across a collection of pretty slick looking desktop haptic devices by Force Dimension.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
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I think it's a little unclear, but Kamen has actually introduced TWO devices. One is a water filter, and the other is a generator (which can be used to power the filter). It's not a single magic box that generates clean water AND electricity.