I'm still trying to find out what I can about TEFL and blogs - boning up on blogging.
There is the first TEFL blog I ever came across - ages ago - written by Jeffrey Hill:

http://englishblog.blogspot.com/

This has been discontinued, but the archives are there, and there is a follow-on site.


There is a useful, short article at:


http://www-writing.berkeley.edu/TESL-EJ/ej22/int.html