ahh, time for the ab articles to start rolling in...
In this article, there really is nothing new.
We already know the anatomy of the abs and surrounding muscles.
We already know the function of the abdominals and surrounding muscles.
We already know that crunches stimulate the abdominals.
I found it interesting that you said that having well developed abdominals will result in less lower back pain. While this may be true to a certain extent, wouldn't common sense tell you to work the lower back to get rid of lower back pain?
We already know the myth that endless repetitions with no weight is not effective, and we also already know that low rep/heavy weight ab exercises work. I can not emphasize enough that most of this stuff is rehashed. It is almost identical to these articles:
http://www.bodybuilding.com/fun/matt91.htm
http://www.bodybuilding.com/fun/mike2.htm
http://www.bodybuilding.com/fun/franco3.htm
http://www.bodybuilding.com/fun/zaino8.htm
http://www.bodybuilding.com/fun/benblack11.htm
http://www.bodybuilding.com/fun/rob8.htm
And there are many more. You have to ask yourself, what is new about your article? As you can see, there is a recurring theme in your article, and the ones I linked above. They all start out with an "anatomy lesson" and continue to descibe various types of crunches and swiss ball crunches and leg raises.
What I have derived from many articles from here, and many other sources:
-You will never see your abs unless your diet is in order. No diet manipulation, no abs!
-While cardio can certainly play a role, lets prescribe something other than boring steady-state cardio. Mix it up and prescribe HIIT, jump rope, sprints, something different! Mike Mahler has an excellent article about this.
-Enough with these endless variations of crunches and swiss ball exercises. Lets go for movements that involve more than the abdominals like turkish get-ups and barbell rollouts. While we're at it, lets get some accentuated eccentric ab movements, like 15-second eccentric sit-ups (see Christian Thibaudeau's ab training articles over at t-mag). Again, something that has not been written about 50 times before.
I hope you don't take this as a flame against you personally, I just am tired of seeing the same article rehashed over and over. Lets see some innovation!