UCSC Grateful Dead Research Guide. Compiled by McHenry Library Reference staff to help students with questions about researching the Grateful Dead phenomenon:
http://library.ucsc.edu/help/howto/grateful-dead-research-guide

Official Grateful Dead website: http://www.dead.net/

Annotated Grateful Dead lyrics: http://artsites.ucsc.edu/gdead/agdl/

Complete Guide to Grateful Dead Set Lists: http://deadbase.com/

Dead Letters: A scholarly annual devoted to the Grateful Dead and their related contexts: http://deadletterspress.com/

Ice Nine Publishing (Ice Nine licenses the compositions of the Grateful Dead): http://www.iceninepublishing.com/