] After more than two decades of research, the science and technology behind
] electromagnetic (EM) rail guns has now advanced sufficiently to allow practical
] exploration of novel military applications, according to Dr Harry Fair, director of the
] Institute of Advanced Technology (IAT) at the University of Texas (UT).

This particular implementation is quite interestesting. I had the opportunity to participate at the IAT lab working under Harry Fair while in Austin. There's nothing quite like seeing a two stage light gas gun throw an aluminum rod through active armor plating.

http://www.iat.utexas.edu/visit.html