Here is an excellent tribute to him by the excellent Matt Stone and Trey Parker.
UPDATE: From the Wall Street Journal:
Mr. Kim died from fatigue during a train ride on Saturday, a weeping television announcer said.
I didn't know that riding in a train took that much out of you.
UPDATE II: Here is Kim Jong Il's legacy.
The number of prisoners held in the North Korean gulag is not known: one estimate is 200,000, held in 12 or more centres. Camp 22 is thought to hold 50,000.
Most are imprisoned because their relatives are believed to be critical of the regime. Many are Christians, a religion believed by Kim Jong-il to be one of the greatest threats to his power. According to the dictator, not only is a suspected dissident arrested but also three generations of his family are imprisoned, to root out the bad blood and seed of dissent.