Nice article, Moz.
Just to add something, cos I always have to add something.
They don't talk about one very important aspect which is where the bowling arm finishes.
Simply put, if a right-hander is bowling outswing, his right arm should finish on the left of his body, while for inswing his right arm should finish past his right hip.
I remember making that one simple adjustment and the results were immediately obvious. Have known a few bowlers over the years that struggled with inswingers and, having shown them that adjustment, the feedback was always positive...after they got used to the change.
I think what it comes down to is that if you're are trying to bowl an inswinger, knowing that your arm will have to finish beside your right hip, you naturally adjust your action and release accordingly, and the ball has a much better chance of coming out with the seem being less wobbly and pointing where you want it to point.
Hoggard talks about it briefly here...