Best/worst practices would be a really good addition. Example:
One of our products is a book called 'Where to Find Gold in California'. Through our own PPC
efforts, we learned that most PPC
engines will include searches for "california gold rush
" among what they consider to be broad match results. These searches flat do not convert, so suggesting affiliates add "rush" to their negative keywords would help prevent wasted PPC
Anything you know about how to successfully market your products would be useful to your affiliates. They don't know your industry as well as you do.