great article - thanks for posting.
http://www.ccli.org/
You're welcome.
I've heard stories from women that had trouble conceiving until they went through the NFP classes. It really surprised me how little I knew about my own body. I strongly urge anyone of childbearing age(okay, not little girls!) to take a NFP course. It's not painful! Honest! :o)
I'm pretty sure that Couple to Couple League does the Creighton method. The Sympto-Thermal method, as discussed in this article, is taught by Northwest Family Services.
http://www.nwfs.org/