The Ponheary Ly Foundation
Reading the website of the Ponheary Ly Foundation adds another dimension to the guiding work this former teacher is doing, and that is providing supplies for the school-children around Siem Reap. Bottom-line is $12 buys the necessary items for one child for one year. I haven't met Ponheary Ly (pictured) myself but suggest you have a look at the website set up by two American travelers who state they've seen some of the world, but no destination left an impact quite like Cambodia, and no people ever affected us in quite the same way. They speak very highly of her, as do many other satisfied travellers on various forums and websites. However, if you don't want to hire her for her guiding qualities, perhaps you can consider the worthy cause she promotes in support of the primary school kids in and around Siem Reap.
Read more about the Ponheary Ly Foundation here.
There are a plethora of charities, foundations and people doing great work in Cambodia. This appears to be one such organisation. Another one is the Schools for Children of Cambodia, who are holding an informal gathering on Saturday 5 August in London to update their supporters and volunteers on their current projects. Their Cambodia country Manager Rachel Palmer will be there on a brief visit to the UK, as will actress Cathy Shipton who has recently returned from filming in Cambodia. During her trip Cathy took some time out to visit one of their schools where she spent an afternoon meeting the children and staff, and she'll provide the meeting with an update of her trip and her experiences during her stay in Cambodia. The website for SCC is at http://www.sccambodia.org.