What did the Nuremburg and Tokyo trials establish for future war crimes?

Answer 1

These sites should be of considerable help with this question.

http://religion.rutgers.edu/courses/347/readings/war_crimes.html
http://www.cbc.ca/news/background/warcrimes/icc1.html
http://www.beyondintractability.org/essay/int_war_crime_tribunals/
http://en.wikipedia.org/wiki/International_Military_Tribunal_for_the_Far_East