School of Celtic Studies(site info)
Part of the Dublin Institute for Advanced Studies in Ireland. Includes a full publications catalogue, online editions of the Celtica journal, scholarship information and links. [English/Gaelic]
http://www.celt.dias.ie/
Harvard University(site info)
Overview of their Department of Celtic Languages and Literatures offering instruction and training in the languages and literatures of the Celtic-speaking peoples. Includes admission requirements and faculty profiles.
http://www.fas.harvard.edu/~celtic/