Pete - a friend of mine has done several treks in Nepal and Bhutan and is friends with Jamling Norgay (the son of Tenzing Norgay - who summited Everest with Sir Edmund Hillary).
My friend has e-mailed Jamling and will let me know if he recommends a particular fund or organization. Meanwhile, she's checking to see what the American Himalayan Foundation is doing to help. Jamling's brother works there.
http://www.himalayan-foundation.org.