@Alan: all countries that I know of have rounded their pre-metric units. The German Pfund, the Dutch pond and the French livre are all 500g rather than some odd number. None of those units is used officially, but most people know them and use them in everyday communications, just like the dag (Dekagramm or short Deka) in Austria and Hungary, which is a metric unit but as far as I know not used anywhere else. The "douzaine" is the only non-decimal unit still in use in Continental Europe as far as I know (except seconds, minutes, etc. of course *g*).
