Thanks for the great information. I don't have it working yet, but I will let you know.
It seems as though this tutorial is mainly for having the pack product show separately on the shopping cart. This is good, but it really would be better to have the cart rules show as a specials block on the product pages. This would make everything much quicker for adding specials to all the products on the website.
Thanks again and I'll let you know how it goes.
-Nathan