KhmerOS
“The Khmer Software Initiative is a joint project of the National Information Communications Technology Development Authority (NiDA) of the Royal Government of Cambodia and the Open Institute. The Khmer Software Initiative is part of the necessary work for the accomplishment of the Government's Master Plan for the Implementation of Open Source Software in Cambodia.”
http://www.khmeros.info

CambodiaXP
“Cambodiaxp.com was established by Sokhodom Pheng in December 2004. It was originally a collection of Pheng's flash tutorials which he wrote during his free time in his final year at NTU.” This site now offers a wide range of Flash and web design related content.
 http://www.cambodiaxp.com

Khmer Tutorials
“KhmerTutorials.com is a tutorial site, developed by a student at National University of Management in the field of Management Information System. All contents of khmertutorials.com are completely free and developed for sharing resources and especially for cambodian students (khmer students) who want to improve their skills.” A wide range of tutorials hand picked from across the web, with the purpose of assisting Cambodian IT enthusiasts.
http://www.khmertutorials.com  

Khmerang
“Khmerang.com is a blog of a western web designer / developer  living in Phnom Penh, Cambodia. I'm not intentionally trying to offend anybody or anything, don't take these scribblings too seriously. Please.” Although this site has not been updated in some time, much of the content is still interesting and relevant.
http://www.khmerang.com