A ZTnews reader and world traveler reports twice sighting thermoelectrics in the real world.  A quick Google didn't turn up any photos of the TE devices, but here is the report:

"Last time I visited the Real Goods Solar Living Center in Hopland California they were selling those little TEG kitchen fans as novelties -- put it on your stove and it starts spinning.  I'm sure you've seen them all. That encouraged me, but what really  got me thinking about this was a trip to Iceland's Solheimer Eco-Village (http://www.inhabitat.com/2005/07/27/icelandic-eco-village/), a couple of hours drive from Reykjavik.

They had a demonstration bathroom with a Peltier/Seebeck device that powered a light and a small television. The hot water source was geothermal, the cold water source was the icy streams that flow through the property, so they claimed they always had the right delta-T without investing any energy at all.  If you get a chance and haven't been, I suggest a trip (the local power company also took me on a nice tour of the geothermal stations, one of which had an outdoor steam pool called the blue lagoon as its effluent)."

So, I'm looking for a sponsor to send me to Iceland!  Well, and bring me back too.