Yes, there is a couple of affiliate programs for Holly's book. I've recently switched to using her program set up through Plimus. Holly seems to be having much better success with Plimus, handling her program since they really do work harder to please the customers through there system.
But, no sorry you wouldn't get credit for sending people to the forum first etc. It does have to be your direct link in which people purchase through.
I do suggest you use the one she has set up through Plimus though as opposed to Clickbank. Clickbank's policies are ridiculous when it comes to refunds. Sometimes I'll make sales of some products, people will get the product, use it up for all it's worth and then claim a refund. It's BS in a way, and it's always seems to be the same people that refund because of their lenient policies. Basically, it's people abusing their system. Chronic refunders we call them!
Hope that helps.
A link to sign up at Holly's program through Plimus can be found at her blog
http://www.honestholly.com. Cheers
Davin