This website gives a very detailed chronology about the path to the trials. It gives information about the start of the court system and goes through the trial as it occurred. It takes from the starting point of June 21, 1997 through October 7, 2005. It begins by talking about how Cambodia asked for help from the United Nations and then goes into the different things that went on before the trials occurred and finally goes into what occurred and the outcome of the trials.
Sipress, Alan, "Khmer Rouge Trials Stalled by Political ...