Adwords is fundamentally about your marketing process, and should include optimizing not just your ads, but your landing pages as well. I am finding that the Taguchi Method might be very useful in this, and am working on getting some software made to test my own landing pages to see if this works.

I came across a couple other interesting things in my Taguchi research today:

1) It looks like the good old ad comparator is up at:
http://www.adcomparator.com

This free site uses the taguchi method to tell you which advertisement you should use after you plug in the results of your tests.

Of course I am too lazy to do this, I want my software to do it for me!!!

Also of interest if you are a do it yourselfer and into excel is:
http://www.qimacros.com/free-lean-six-sigma-tips/design-of-experiments.html#doetemplate

These guys have figured out the math and put it into excel, and it looks like you can buy their whole package for 500 bucks, which is a lot less than some people are charging for it.

If you go to their freestuff.html page, you can download an evaluation copy of their software which should help you quite a bit.

This is a bit more complex explanation of how the taguchi method works:
http://www.statease.com/e6ug/DE05-Taguchi.pdf

If anyone finds some more resources, please send them to me and I will add them here.

-Steve

Steve Blom
Certified Google Adwords Professional

Adwords Training Video Author:

Blog:
http://marketingnewsblog.adwordstraining.org

Free Adwords video:
http://www.adwordstraining.org/video/free_adwords_tutorial_video.htm

Contact: steve@adwordstraining.org