This site looks at endangered languages all over the world. The site is an excellent resource for gaining a perspective on the wide scope of the problem and the many languages that are on the verge of disappearing.
Resource links to scholarly publications and various types of research can be found at this site. There is an easy to use searchable database that can point to information related to education, anthropology, political issues and environmental factors.
One of the most useful parts of the site is the worldwide language map which indicates locations across the globe where languages are at risk or severely endangered of becoming extinct.