A very good place to start:
http://www.msgtruth.org/
With an amazing Pdf file flow chart linking many different 'things' together in a very neat theory.
http://www.msgtruth.org/images/Theor...Simplified.pdf
Do read this page even though it is on Rense.com
http://www.rense.com/general52/msg.htm
It contains alot of the 'unknown' names for MSG!
This Pdf is a hard scientific read, but worth at least saving and learning from.
http://www.cnl.salk.edu/~fellous/pubs/emo.pdf
MSG is the devil as far as I am concerned of the food world. Aspartame and fluoride are his hand maidens.