A second law-violating device I proposed in 2002:
http://proceedings.aip.org/resource/2/apcpcs/643/1/430_1
AIP Conf. Proc. 643, pp. 430-435, Pentcho Valev 2002: "...as two vertical constant-charge capacitor plates partially dip into a pool of a liquid dielectric (e.g. water), the liquid between them rises high above the surface of the rest of the liquid in the pool. Evidently, if one punches a macroscopic hole in one of the plates, nothing could prevent the liquid between the plates from leaking out through the hole and generating an eternal waterfall outside the capacitor. This hypothesis has been discussed on many occasions but so far no serious counter-argument has been raised."
Here are an experimental demonstration of the rise of the liquid between the plates:
http://www.youtube.com/watch?v=T6KAH1JpdPg
"Liquid Dielectric Capacitor"
and a schematic picture of the "eternal waterfall":
http://energythic.com/usercontent/3/DIEPHOPU_caphole.gif
Why will water leak out through the hole? Because the additional elevation (beyond that due to capillary forces) is caused by an increase in the liquid pressure between the plates:
http://www.amazon.com/Introduction-To-Electromagnetic-Theory-Perspective/dp/0763738271
Introduction to Electromagnetic Theory: A Modern Perspective, Tai Chow, p. 267: "Calculations of the forces between charged conductors immersed in a liquid dielectric always show that the force is reduced by the factor K. There is a tendency to think of this as representing a reduction in the electrical forces between the charges on the conductors, as though Coulomb's law for the interaction of two charges should have the dielectric constant included in its denominator. This is incorrect, however. The strictly electric forces between charges on the conductors are not influenced by the presence of the dielectric medium. The medium is polarized, however, and the interaction of the electric field with the polarized medium results in an INCREASED FLUID PRESSURE ON THE CONDUCTORS that reduces the net forces acting on them."
http://farside.ph.utexas.edu/teaching/jk1/lectures/node44.html
"However, in experiments in which a capacitor is submerged in a dielectric liquid the force per unit area exerted by one plate on another is observed to decrease... (...) This apparent paradox can be explained by taking into account the difference in liquid pressure in the field filled space between the plates and the field free region outside the capacitor."
http://www.amazon.com/Classical-Electricity-Magnetism-Second-Physics/dp/0486439240?tag=viglink21401-20
Classical Electricity and Magnetism: Second Edition (Dover Books on Physics), Wolfgang K. H. Panofsky, Melba Phillips, p. 114: "This means that if a system maintained at constant charge is totally surrounded by a dielectric liquid all mechanical forces will drop in the ratio 1/k. A factor 1/k is frequently included in the expression for Coulomb's law to indicate this decrease in force. The physical significance of this reduction of force, which is required by energy considerations, is often somewhat mysterious. It is difficult to see on the basis of a field theory why the interaction between two charges should be dependent upon the nature or condition of the intervening material, and therefore the inclusion of an extra factor 1/k in Coulomb's law lacks a physical explanation." p.115: "Therefore the decrease in force... cannot be explained by electrical forces alone." pp.115-116: "Thus the decrease in force that is experienced between two charges when they are immersed in a dielectric liquid can be understood only by considering the effect of the pressure of the liquid on the charges themselves. In accordance with the philosophy of the action-at-a-distance theory, no change in the purely electrical interaction between the charges takes place."
Here is my explanation of the effect:
http://www.gsjournal.net/old/valev/valev2.pdf
Pentcho Valev: Biased Thermal Motion and the Second Law of Thermodynamics
The "floating water bridge" is essentially the same phenomenon - water absorbs heat from the surroundings and use it to "climb out of the beakers":
http://phys.org/news/2007-09-bridge-exposed-high-voltage.html
"When exposed to a high-voltage electric field, water in two beakers climbs out of the beakers and crosses empty space to meet, forming the water bridge. The liquid bridge, hovering in space, appears to the human eye to defy gravity."
https://www.youtube.com/watch?v=FhBn1ozht-E
The Floating Water Bridge
Pentcho Valev