To -Er is to Err - A case of code-switching in standard Mandarin. - http://www.indiana.edu/~easc/resources/working_paper/noframe_3b.htm
Code Switching eGroup - Unmoderated e-mail list for the discussion of alternation of linguistic varieties, bilingual conversation and related phenomena. Requires free registration. - http://groups.yahoo.com/group/code-switching/
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
Codeswitching in Conversation Forum - A discussion area for those interested in the topic of code switching. - http://www.udc.es/dep/lx/cac/c-s/forum.html