Ethnoarchaeologists might find this site useful, perhaps? The Center for Ethnic Studies and Development at Chiang Mai University has a website with a database of downloadable articles about ethnic populations in Southeast Asia. While there is a distinct Thai focus in the site, about 40% of the 12,000 articles are in English. An e-museum also features video clips of some local ethnic cultures. (from New Mandala)
Center for Ethnic Studies and Development