one of the best weapons in the nanotech age would actually probably be nanobots.
one could recite a tech-chapter from "alpha centauri" ( unofficial sequel to civ III ) - nanobots are able not only to decontruct your enemies gear, but they can also decontruct your enemy itself ( biomatter ) - and it doesn t stop there.... ! - if programmed correctly, they will construct new gear for you out of the molecules.
so at the same time you can destroy your enemy and your enemies soldiers or civilians - and have your nanobots build a new ship, a tank or a base out of them. much more efficient than any weapon that can only destroy.
and once they are done - there is no radiation left, nothing. - you can even have them "clean up" after they have done their work.
and... in freelancer - we ARE in the nanotech age.