For those like me who need a little more background information about the history of Cambodia, specifically with regard to the Khmer Rouge, here are a few helpful links.

http://www.time.com/time/world/article/0,8599,1879785,00.html
http://www.cambodia.org/khmer_rouge/
http://topics.nytimes.com/topics/reference/timestopics/organizations/k/khmer_rouge/index.html

The first is a history of the Khmer Rouge that appeared in Time magazine in 2009.  The second is from the Cambodian Information Center and obviously provides a different perspective.  The last is 2009 New York times article outlining the trials of surviving Khmer Rouge leaders which just began in 2006!