A Minimalist Approach to Intrasentential Code Switching 1997 dissertation by Jeff MacSwan which explores the grammatical structure of Spanish/Nahuatl code switching. Available as PDF file or as a zipped download. http://www.public.asu.edu/~macswan/diss.html
Code Switching Behavior and Knowledge of Adults and Children A study of Spanish/English code switching practices and the linguistic knowledge of bilingual children and adults. http://hamminkj.cafeprogressive.com/CS_paper.htm
Code Switching eGroup Unmoderated e-mail list for the for the discussion of alternation of linguistic varieties, bilingual conversation and related phenomena. Requires free registration. http://groups.yahoo.com/group/code-switching/
Rethinking conversational code-switching: codes, speech varieties, and contextualization Article on the purposes and varieties of code switching by Celso Alvarez Caccamo. Also available in PDF format. http://www.udc.es/dep/lx/cac/artigos/bls90.htm