Yogurt articles of interest

I've tried making yogurt twice now.  Once was sucessful and once wasn't.  I'm including some links here to try...

http://www.treehugger.com/files/2005/12/easy_homemade_y.php

https://www.dvo.com/newsletter/monthly/2003/june/0603tabletalk.html

http://burganfamily.blogspot.com/2008/10/homemade-yogurt-in-crock-pot.html

http://crockpot365.blogspot.com/2008/10/you-can-make-yogurt-in-your-crockpot.html