Use the Force, Skywalker-san!
Aikibiker, I've heard the same thing, except that it would not be a static LASER weapon as lightsabers are, rather it would be a PLASMA field (the stuff stars are made of) held in stasis (as in it doesn't fly all over tha place or explode) by a strong magnetic field that focuses the plasma in a sword shaped matrix.
At present it is almost technologically viable, except for the energy source that has enough power to create the plasma AND power the magnetic field matrix long enough to be of some use. So who knows, maybe someday it might be possible.
Although I've never liked the Jedi's Ken technique, they hold them like baseball bats! Ughh, bad technique! Not Aiki at all.