The Feb 10th issue of Physical Review Letters included a paper by some researchers at Rensselaer which confirmed earlier experiments done at UCLA to achieve nuclear fusion at room temperature using pyroelectric crystals. I've only done a cursory reading of the paper, but it looks like what they do is take two crystals which develop a strong charge on their surface when heated or cooled. They put these crystals in vacuum and heat them a bit which causes a very strong electric field to develop between the crystals. The field drives electrons between the crystals with enough energy to create a fusion reaction. The authors state that this system is probably not useful as an energy source, but they do expect to be able to use the technology to create a hand-held neutron generator.