My own research links, mostly in sociology of language, conversation analysis, and workplace studies:

Paul ten Have's site: the Best in the World if you're in EM/CA business

King's College, London, has a group headed by C. Heath: http://www.kcl.ac.uk/depsta/pse/mancen/witrg/

Computer stuff:

Helsinki U of Technology, Usability Lab

University of Tampere, Usability Lab in Computer Science.